Renewable Energy

Renewable energy doesn't get used up, in the way that coal and oil do. It is still there the next day, such as sunshine; wind power; water power from rivers and oceans; and geothermal power, which uses the heat deep below the surface of the earth.

5,959 Questions
Home Electricity
Electrical Engineering
Renewable Energy
Fuel Cells

How many types of circuit breakers and their ratings in details?

There are several type of circuit breakers now a day we are using these are as follows:

1. M.C.B. (Miniature circuit Breaker)

Rating : 1, 2, 4, 6, 10, 16, 20, 25, 32, 63 Amperes

2. M.C.C.B. (Miniature current circuit Breaker)

Rating : 10, 16, 20, 25, 32, 63, 100, 200, 250, 400 Amperes.

3. A.C.B. (Air Circuit Breaker)

Rating : 400, 800, 1000, 1200, 1500, 1800, 2000 Amperes.

4. A. B. Switch (Air Breaker)

used in High tension line.

5. SF6 Breaker (Contact break in the Sf6 medium)

used in High tension line.

Renewable Energy

What makes an energy source renewable?

A useful definition of a renewable resource is one "that can be replenished naturally with the passage of time." Typical examples of renewable sources of energy include solar (thermal & photovoltaic), wind (turbines), water (dams, tidal, wave), geothermal, and biomass.

There are a number of caveats that should be mentioned here however, such as the fact that at long enough time scales all sources of energy are ultimately finite. For example, the hydrogen that fuels the Sun's conversion of energy into light which yields photosynthetic biomass and that drives Earth's atmospheric wind pressure systems along with its hydrological cycle is consumed irreversibly. Geothermal energy arises from the natural radioactive decay of unstable elements deep in the Earth's interior and such radioactive decay is also finite in nature.

In addition technologies needed to harness these renewable forms of energy require material inputs which are not themselves "renewable". For example, both multi-junction photovoltaic solar cells and wind turbine-generator magnets require rare-earth elements.

Given these qualifications there is no reason to exclude nuclear fission from renewable energy mix. After all both thorium and uranium are a lot more common than rare-earth elements such as indium, neodymium, or praseodymium. Furthermore it is estimated that the oceans of the world contain dissolved within it some 4.5 billion tons of uranium; and its rate of consumption in fast-spectrum breeder reactors would be constantly renewed by additional deposition from rivers and streams.

Environmental Issues
Nuclear Energy
Renewable Energy

Is nuclear energy renewable or non-renewable?


Renewable Energy
Wind Power

How much space does one wind turbine take up?

One wind turbine consumes about 20 square meters of land at its base. There are sometimes gravel roads that lead to them from the nearest road, usually 2-3 meters wide and 10-50 meters long, to allow maintenance trucks to get to them. Calling it 120 square meters per wind turbine of actual land taken out of use isn't far off.

That's about a tenth of a hectare or a quarter of an acre. The rest of the land is still useful for whatever it was being used for before, whether that was farming, hiking, growing weeds, snowmobiling, grouse hunting or just sitting there unused.

As a wind turbine will generally bring in a lease value of $5000 - $8000 per year to the owner of the land, and as that is higher than most crops will yield per acre per year, it's an excellent additional revenue stream, especially for the multi-revenue stream, small-business owners we call farmers.

As wind turbines are spaced 6-10 blade diameters apart, a gigawatt of power generation would be spread over about about 518 square kilometres, or about 200 square miles. It would take up about 0.01% of that land. If it were all compressed together, it would be about the size of a nuclear plant.

There's a US land use requirements reference at the link referenced.

Waste and Recycling
Renewable Energy

What are some renewable objects?

Trees, leaves, crops, vegetables, sheep, cows, fish, birds, mulch and paper.
mulch and paper

Renewable Energy
Solar Power

What are the advantages and disadvantages of biomass?


  • Good for environment as the carbon dioxide it releases is only months old so is part of the normal carbon cycle.
  • Biomass doesn't emit additional carbon dioxide (CO2), like fossil fuels. It releases the CO2 that it took in during its short lifetime. Using biomass instead of fossil fuels prevents further addition of CO2 in our atmosphere.
  • Biomass can be used to make a variety of fuels to generate electricity
  • Biomass is used for the production of chemical products
  • Biomass waste can help in reducing disposal costs
  • Biomass waste can extend the life of landfills
  • biomass is renewable.
  • it can make our life easier
  • Can use waste products and therefore can have negative fuel costs
  • Can create several products - electricity/heat/biogas/biofuel
  • Very large resource
  • Lots of different technology
  • released in several ways


  • Biocrops have a higher value than food and can detract food production, leading to food shortages and increased prices
  • Heat and some pollutants are released into the atmosphere, adding to global warming
Environmental Issues
Renewable Energy
Green Living

What is a renewable resource?

A renewable resource is something that we can use, and it's still there after we've used it. Solar power, geothermal power (heat from deep under the ground), wave and tidal power and wind power are all renewable.

Renewable resources can also be resources that need some effort to use up like oxygen, wood, fish, insects.

The definition written in the dictionary :any natural resource (as wood or solar energy) that can be replenished naturally with the passage of time.

Coal, oil, natural gas and other fossil fuels like wood that we burn once are finished and are non-renewable.

Environmental Issues
Renewable Energy
Hydro Power

What are the advantages and disadvantages of hydro-electric power?

Hydro comes from the Greek word for water. Hydro-electricity, or hydro-power, is usually generated by turbines in a dam in a river. The dam means that a great body of water builds up in the river valley behind the dam. This is released through the turbines when electricity is needed.

Smaller than dams are barrages across the mouths of rivers which capture water from high tides and release it to generate electricity. Smaller still are turbines in river and tidal streams which do the same thing.

A. Advantages:

  • Does not depend on costs of uranium, oil, or other fuels
  • Pollution is rarely created
  • It doesn't require as many employees
  • It can be set up in many sizes
  • Stations can operate and run for long periods of time
  • Reduces greenhouse emissions
  • Relatively low maintenance costs
  • Can be used throughout the world
  • It is renewable
  • Hydroelectricity produces no gas emissions or waste.
  • Hydroelectric stations are inexpensive to operate.
  • Makes barely any pollution compare to other ways of creating electricity
  • Hydroelectric power is one of the most responsive (easy to start and stop) of any electric power generating source.
  • The conversion of the forces of water to electric energy can be up to 90 percent efficient.
  • Hydroelectric power produces no chemical or waste heat pollution.
  • Hydroelectric power plants require little maintenance.
  • Reservoir lakes can be used for recreation, and can provide considerable flood protection to downstream areas.
  • Groundwater reserves are increased by recharging from reservoirs.
  • Plants usually have an expected life span two to three times longer than conventional thermal power plants.
  • Hydroelectric installations can be used to breed fish and other aquatic products
  • It is more reliable than solar and wind power - because water can be stored and there is more of it, more often.Once a dam is constructed, electricity can be produced at a constant rate.
  • If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity.
  • Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades.
  • The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right.
  • The lake's water can be used for irrigation purposes.
  • When in use, electricity produced by dam systems do not produce green house gases. They do not pollute the atmosphere.
  • Hydropower is a fueled by water, so it's a clean fuel source. Hydropower doesn't pollute the air like power plants that burn fossil fuels, such as coal, oil or natural gas.
  • Hydropower is a domestic source of energy, produced locally near where it is needed.
  • Hydropower relies on the water cycle, which is driven by the sun, thus it's a renewable power source so long as the rain keeps falling on the dam catchment area.
  • Hydropower is generally available as needed; engineers can control the flow of water through the turbines to produce electricity on demand.
  • Hydropower is not only a cleaner source of energy than oil but is it more cost effective as well. The most efficient coal burning plants are only able to convert around 50 percent of their energy into electricity, whereas modern day hydro power turbines convert up to 90 percent of their energy into electricity.
  • Hydropower can cost less than a penny per kWh (Kilowatt Hour) compared to fossil fuel power plants at around 2 to 3 cents per kWh. That may not seem like a big difference, but when factored out over a year and the millions of kW hours Americans burn, it adds up to a huge savings.
  • Hydropower plants also have an added bonus as they create recreational opportunities for people as well as electricity. Hydro power dams provide not only water-based activities, but since much of the surrounding land is public they also encourage numerous other outdoor activities aside from boating, skiing, fishing, and hunting.
  • Hydropower plants provide benefits in addition to clean electricity. Hydro power plants create reservoirs that offer a variety of recreational opportunities, notably fishing, swimming, and boating. Most hydro power installations are required to provide some public access to the reservoir to allow the public to take advantage of these opportunities. Other benefits may include water supply and flood control.
  • Can help regulate river flows (flood prevention), stores water, creates recreational lake (though these uses often conflict).

B. Disadvantages:

  • High investment costs
  • Dependent on precipitation
  • Sometimes messes up wildlife
  • Loss of fish species
  • Change in river or stream quality
  • Cost for construction
  • Hydroelectric power production require flooding of entire valleys and scenic areas.
  • Disrupts natural seasonal changes in he river, and ecosystems can be destroyed.
  • Ends flooding that help to clean out the silt in rivers, causing them to clog (Energy Laboratory).
  • The silt that usually flows down to the Beaches and Estuaries is block by the dam.
  • Studies show that the plant decay caused downstream of major dams produces as many greenhouse gasses as more conventional methods of producing electricity.
  • Dams are expensive to build, and due to drought may become useless, or produce much less power than originally planned.
  • A dam being built in Quebec may end up flooding a land area as large as Switzerland.
  • Dams can break in a massive flash flood
  • Construction costs of large-scale hydroelectric projects are high.
  • Damming rivers causes changes in ecological cycles and surrounding landscapes; self-regulating ecosystems are changed into ones that must be managed.
  • Sedimentation can progressively curtail a dam's ability to store water and generate energy.
  • There are a limited number of feasible sites for large dams.
  • Damming can cause loss of land suitable for agriculture and recreation.
  • Drought can affect power production.
  • Dams are vulnerable to natural forces. There is a high direct death rate from the failure of dams.
  • River channels downstream from dams are more susceptible to erosion.
  • A disadvantage of hydroelectric power stations is that it destroys wildlife and habitats of any creatures living in the area.
  • Dams are extremely expensive to build and must be built to a very high standard.
  • The high cost of dam construction means that they must operate for many decades to become profitable.
  • The flooding of large areas of land means that the natural environment is destroyed.
  • People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.
  • The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earth's surface at its location.
  • Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.
  • Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighboring countries.
  • Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from 'rising damp' caused by the changing water table level.
  • Hydro power dams can damage the surrounding environment and alter the quality of the water by creating low dissolved oxygen levels, which impacts fish and the surrounding ecosystems. They also take up a great deal of space and can impose on animal, plant, and even human environments.
  • Fish populations can be impacted if fish cannot migrate upstream past impoundment dams to spawning grounds or if they cannot migrate downstream to the ocean. Upstream fish passage can be aided using fish ladders or elevators, or by trapping and hauling the fish upstream by truck. Downstream fish passage is aided by diverting fish from turbine intakes using screens or racks or even underwater lights and sounds, and by maintaining a minimum spill flow past the turbine.
  • Hydro power can impact water quality and flow. Hydro power plants can cause low dissolved oxygen levels in the water, a problem that is harmful to riparian (riverbank) habitats and is addressed using various aeration techniques, which oxygenate the water. Maintaining minimum flows of water downstream of a hydro power installation is also critical for the survival of riparian habitats.
  • Hydro power plants can be impacted by drought. When water is not available, the hydro power plants can't produce electricity.
  • New hydro power facilities impact the local environment and may compete with other uses for the land. Those alternative uses may be more highly valued than electricity generation. Humans, flora, and fauna may lose their natural habitat. Local cultures and historical sites may be flooded. Some older hydro power facilities may have historic value, so renovations of these facilities must also be sensitive to such preservation concerns and to impacts on plant and animal life.
  • By 2020, it is projected that the percentage of power obtained from hydro power dams will decrease to around four percent because no new plants are in the works, and because more money is being invested in other alternative energy sources such as solar power and wind power.
  • Dams usually flood large river valleys, covering a lot of native habitat with water, displacing animals and sometimes people. In China more than one million people were moved when they built their big "Three Gorges" dam. Many archaeological sites are now unreachable under water and there is environmental damage along the banks of the many tributaries of the Yangtze River

In brief:

Hydro was the first commercial source of power of any size. The uses were understood right away, but there certainly are drawbacks.

They destroy farmland and alter the course of rivers. They must also be located at the discretion of the plant rather than our choosing. Much of our power that we use today is not even used constructively. There is a large portion of our energy that is used in transporting it across the country. The major disadvantage I would put against this form of power would be the land and energy consumed in transporting the power away from the plants. Grid loss is a major issue for energy users.

It is a renewable energy source. Unlike fossil fuels which will eventually run out, hydro power plants do not use up the energy source. It is also not polluting to the environment. They output power at a relatively reliable rate (compared to solar or wind, especially). On the other hand, they drastically affect all ecosystems upstream of the dam, and are much more environmentally destructive than nuclear power plants.


  • Inexhaustible fuel source
  • Minimal environmental impact
  • Viable source--relatively useful levels of energy production
  • Can be used throughout the world


  • Smaller models depend on availability of fast flowing streams or rivers
  • Run-of-the-River plants can impact the mobility of fish and other river life. NOTE: Building a fish ladder can lessen this negative aspect of hydroelectric power.
Renewable Energy
Wave Power

What are the advantages and disadvantages of using the energy from ocean waves?

  • Wave power is a renewable Energy Source.
  • Wave Energy Is a Clean Fuel.
  • Wave Energy is Environmentally Friendly - it doesn't destroy the environment.
  • There is plenty of it.
  • Tides/Waves are always predictable.
  • you can always produce a significant amount of energy.
  • you don't need fuel so it doesn't cost that much .
  • Waves are free and will not run out so the cost is in building the power station.
  • Wave power does not produce greenhouse gases.
  • There are very few safety risks with wave power generation.
  • Harnessing the power of it is difficult.
  • it can cost a lot of money and requires further research.
  • If the whole tidal/wave energy scheme does get popular real estate will be losing money for beach front houses since they will be using the beaches for the tidal/wind farms.
  • It depends where you put it for the costs so not much good financially
  • May interfere with mooring and anchorage lines commercial and sport fishing.
  • Waves can be big or small so you may not always be able to generate electricity.
  • You need to find a way of transporting the electricity from the sea onto the land.
  • Not many people have tried to generate electricity this way yet so the equipment is expensive.
  • It is believed that harnessing wave or tidal power will eventually slow the rotation speed of the planet. It is currently believed that we could cause as much as a full day of loss to our calenders every two thousand years by collecting enough energy from waves and tides.
Nuclear Energy
Renewable Energy
Nuclear Fission

Is nuclear fission a renewable or non-renewable source of energy?

Nuclear fusion is nonrenewable, because it relies on uranium being found and extracted from ores, and there is no way to replace this once it is used up. It is true you can make fissile material from nonfissile U-238, but then eventually all the U-238 would be used up, so that breeding process just enables more energy to be obtained from the uranium source, it does not make any more.

If fusion power becomes a reality this will make a huge energy resource available, namely the water in the oceans, and this would never be used up in millions of years, but strictly speaking it would still not be renewable. It requires hydrogen nuclei as an energy source, and once these have been used in fusion they are not naturally replenished. In fact, fusion power has a very high energy change, rendering it near impossible to reverse the process. A star, for example, is powered by nuclear fusion, and will eventually die out due to a lack of hydrogen.

Nuclear Fission is a non-renewable energy source, but it depends on your perspective. Uranium-235, the primary fuel for nuclear power, has an abundance of 0.7 percent in the Earth. An enrichment of 4% to 5% is required in order to achieve an effective fission reaction, and the half-life of uranium-235 is about 70 million years, with uranium-238 (with an abundance of 99.3%) having a half-life of about 447 billion years. As a result, it is unlikely that we will run out of uranium-235 in the near, mid, and distant future.

In addition, Plutonium-239, an effective alternate source of nuclear power, which can be formed from uranium-238, has a half-life of about 24,000 years.
Because there is no way of making more uranium, once it is used up it will not be replaced. If nuclear fusion becomes possible, using hydrogen isotopes, then there will be a vast new source of energy from the earth's water, but again it is using a fixed resource.

In my view the only truly renewable sources of energy are those which are provided by the sun on a daily basis.

Environmental Issues
Renewable Energy

Which alternative energy source is exhaustible?

  • Biomass
  • Nuclear fission
  • Possibly geothermal

Well, if you want to be pedantic about it, so is solar, wind and tide energy. The sun will transition to red giant in a few billion years then (probably) become a white dwarf. No more sunlight. And even longer after that, as the universe is expanding, due to the law of entropy, everything will eventually be spread out thinly across space, and the energy levels will be constant everywhere. So if you want to be pedantic, EVERY source of alternative energy will run out eventually, but the person asking this question obviously wants to know what alternative energy sources are exhaustible in the timeframe of human existence, and the answer to that is biomass and nuclear (with the current technologies, the figures show we will run out of uranium in about 160-200+ years, but potential new technologies look to be able to extend our uranium supply almost indefinitely). And technically we can run out of (useable) biomass.

Realistically, we're never going to run out of biomass, though producing enough to satisfy fuel demands could be very difficult. Efficient use of current technology and (more important) fuel recycling means that we're unlikely to run out of nuclear fission fuel, either. We're never going to run out of nuclear fusion fuel.

Geothermal is tricky. We're never going to run out of geothermal energy to tap into (as that would require cooling of the earth's core, which won't happen on a human timescale), but individual places where geothermal energy is available can easily change, and as geothermal isn't portable, it is entirely possible for a given location to be unable to produce geothermal power at some point.

Global Warming
Climatology and Climate Changes
Renewable Energy

What is the role of renewable energy in climate change?

Renewable energy has a role only in reducing climate change. In a world powered by renewable energy the greenhouse gases in the atmosphere would slowly return to their normal levels, and the dangers from global warming would disappear.

Energy use from fossil fuel is the dominant source of greenhouse gas emissions made by man. Burning fossil fuels to generate electricity releases additional carbon dioxide which the carbon cycle is unable to deal with. If we could produce all our energy from renewable sources tomorrow we would have very little problem with climate change.

Renewable energy includes hydroelectric power, tidal power, wind, solar, geothermal and biomass. These are not depleted when we use them. If I put a solar panel on my roof, that will not make it less sunny tomorrow. Renewable energy does not cause carbon dioxide emissions, and therefore does not contribute to climate change, like burning fossil fuels does. (Actually, nuclear power is non-renewable, but does not contribute to climate change.)

It is true that no single technology can provide all the power we need, but by combining different technologies (for example: Solar and hydrogen fuel cells, which could store energy from the solar panels for when the sun does not shine), it will be possible to provide base load power from renewable sources.

Environmental Issues
Renewable Energy
Solar Power

How is solar energy easily renewed?

It does not need to be renewed, it is constantly available as long as the sun is shining. And that will last several more billion years.
Solar power is energy collected from the sun. While not 100% renewable, as long s we have sun and a planet to live on, we will have this virtually unlimited power source.

Environmental Issues
Renewable Energy
Green Living

What are renewable and non renewable resources and their uses?

Uses:All these resources are being mainly used to generate electricity. Oil is also used for transport and the production of plastics. Minerals like iron ore and gold are nonrenewable, but may be recycled and reused. Renewable ResourcesA renewable resource is something that is being continually replaced faster than we use it up.
  • Solar energy is considered a renewable source of energy because the sun's energy is continuous. (Note that the rest of this list are all forms of solar power.)
  • Wind Power
  • Water Power (Hydro-electricity from dammed rivers, tidal streams and ocean waves)
  • Thermal Power from the earth (Geothermal: Using the earth's heat to generate electricity)
  • Thermal Power from the ocean
  • Biomass, the burning of plant material, is a renewable resource. Even though the burning puts carbon dioxide into the atmosphere, it also prevents a much greater amount of methane being released by the decomposing vegetation, so it is rated as positive.
  • Trees are renewable because we can replant them.
Non-Renewable ResourcesA non-renewable resource is something that is not being replaced as we consume it.
  • Oil is a good example of a non-renewable resource. It is used to make gasoline and other fuels, as well as plastics, such as grocery bags. We are using billions of gallons of oil every year, but it takes millions of years to be replace. We are using up oil much much faster than it is being produced. Once we use up oil from the earth, it's gone. We can't wait millions of years for some more.
  • Coal is non-renewable.
  • Peat is non-renewable.
  • Uranium is non-renewable.


Most of the time the two terms are referring to sources of energy:

Renewable sources are sources of energy that can be reused or that will continue regardless of you using them: power from the Sun, power from waves, power from wind.

Nonrenewable sources are sources of energy that have a limited supply and will run out, and not be able to be used in the future: Oil, Coal, Gas.


Renewable energy sources are wind, solar, and hydro-power, and biomass. They will never run out. Nonrenewable energy sources are coal, oil, and other fossil fuels. The similarities are that most of them have a relation with the Sun. A nonrenewable energy source and a renewable energy source are similar in the way some of them are used to transform energy (you cannot create energy, it can only be transformed from one energy form to another.) The similarities are few but there are many differences, most of the positives are on the renewable energy's side.


When you use petrol, gas, coal... basically anything you burn to produce heat and then turn this energy into electricity of mechanical energy (a car engine) you are using a raw material that is not going to be replaced. In fact petrol, gas, and coal take million of years to be naturally produced.

When you are burning wood (from trees), the tree grows again... eventually if you let it do so. This energy can be "kind of renewable" as long as another tree grows as fast in order to replace the one you cut.

Renewable Energy
Wind Power

Is geothermal energy cheaper than wind energy?

In short: no.

Geothermal energy harnessing is still in its infancy compared to wind energy, and therefore, more expensive. Overall geothermal energy has been done on a very small scale, but technological breakthroughs need to occur before it can be successfully worldwide.

Then again, with the U.S. energy industry being deregulated, wind energy can be more expensive than other energy types. For instance, when I lived in western Arkansas, I used OG&E as my energy provider, and they offered wind power for just 4.5 cents per kilowatt hour, which was half of a conventional plan. In Texas, providers generally charge 2 cents MORE per kilowatt hour for using purely wind power than conventional.

Renewable Energy

What are the parts of geothermal power plants?

  • Two holes are drilled down into the rock, often several kilometres deep, to reach very hot rock layers.
  • Water is pumped down one and comes up the other, bubbling and steaming.
  • This steam (or hot water) is used to spin a turbine (the same way as a coal fired power station).
  • Electricity generated is fed into the grid and is sold to customers.
  • The equipment needed :
    • Water, which can be reycled indefinitely.
    • A pump.
    • A turbine generator.
    • And originally, a huge drill to drill the shafts.
Global Warming
Renewable Energy
Fossil Fuels

What are some alternate sources of energy?

Alternate Energy Sources: Solar, Wind, Hydro, Biomass, etc.

There are many, but it depends a bit on what you mean by "alternate." Mostly, people mean sources other than fossil fuels (oil, coal, natural gas), and maybe nuclear fission as well. Personally I prefer the term "renewable" sources of energy because the meaning is more clear, and maybe some day in the future renewable energy sources will be our main source of power, and won't be "alternate" at all!

Here are a few:

Solar: Solar power or sun's energy can be used to make both electricity and fuel with solar panels. These panels take energy from sunlight and turn it into either electricity or they drive a chemical reaction to make a fuel (hydrogen gas for instance). More energy from the sun hits the earth's surface in one hour than ALL the energy used by people on the entire earth in one year!

Hydroelectric: By building a dam on a river, and only letting the water pass through a small passage, you can use the force of the moving water to spin a turbine to make electricity.

Geothermal: If you drill down deep enough into the surface of the earth, you will reach very hot rocks. You can inject cold water into this deep hole, and the rocks heat the water, turning it to steam. You can then use this steam to turn a turbine to make electricity.

Wind: Giant windmills spin to make electricity from the force of wind moving through the blades of the windmill.

Biomass: Many plants can be turned into chemical fuels that can be burned. Ethanol is the most common, and usually corn or sugar cane is grown to make ethanol. You can burn ethanol in many cars just like gasoline.

Waves and Tides: The movement of water due to crashing waves or rising and falling tides can be used to spin a submerged propeller or a turbine to make electricity

Fusion: A costly and somewhat dangerous resource is being developed which is known as fusion. This is the same energy which generates the sun's heat and energy. It fuses hydrogen atoms into helium atoms but is not yet cost effective and they have yet to make a self sustaining reaction.

Another view:

Alternate renewable sources of energy are those that can be harnessed naturally and repeatedly by humans without damaging the environment or adding to the possibility of global warming.

Renewable Energy
Wind Power

Where is the world's smallest wind turbine?

the smallest turbine is in thatipur

Environmental Issues
Renewable Energy
Green Living

How can timber a renewable resource could become limited?

Trees may not grow back in an area of deforestation.

As always, our Corporations put Cash ahead of Casualties. Clear-Planting cannot keep up with Clear-Cutting.

Renewable Energy
Niagara Falls

Why is Niagara Falls so important?

Niagara Falls is important on both sides of the Canada-US border for two reasons: it is an important tourist attraction; and it is a major source of hydroelectric power.

Environmental Issues
Global Warming
Renewable Energy

What are some examples of renewable sources of energy?

The main renewable sources of energy to generate electricity are:

  1. hydropower (use of water from rivers, dams, tides and ocean waves)
  2. wind energy (using wind turbines)
  3. solar power (using the power of the sun to heat water or produce electricity)
  4. geothermal (using the heat deep under the earth's crust)
  5. ocean Thermal (using surface heat and deep cold water)
  6. biofuel (producing ethanol from organic material like switch-grass, corn and sugar cane husks)
See the Related Questions links for more information about each of these methods of producing energy.

*Strictly speaking an energy source is not 'renewable' if you mean "can humanity restore it?", as it must with trees, for example.

Geothermal, for example, is self-renewing - the Earth is constantly giving off its heat to water which is close enough to the heat to be warmed by it. It is not diminished to any noticeable extent by our using it. It is possible to use a geothermal resource to capacity locally. One example is in the geothermal area of Rotorua, New Zealand, where too many thermal bores resulted in the decline of the geysers that were a tourist attraction. This has since been addressed by controls on the bores in the area, and the geysers are performing as before.

Heat or light from the sun, wind (turns turbines which produce electricity), and water (the power of the flow turns turbines which produce electricity).
wind, tidal, geothermal and hydroelectricity

Environmental Issues
Renewable Energy
Hydro Power

Why isn't hydro power the best renewable energy source?

Hydro electric power generally is generally thought of as the power of water falling through a distance (like the generators at Niagara Falls). This also a demonstration of the problem with the process, it requires water at high places that can be fed down to generators at low places. this makes it unavailable for flat or arid countries. Hydro power can also include wave or tidal power systems. Large bodies of water are required excluding land locked or arid countries. The third case is turbines in rivers with the attendant concern that not all locations have such resources.

Many small hydro installations of these types can be developed for small user communities, but the ability to replace large thermal power stations is limited.

Environmental Issues
Waste and Recycling
Renewable Energy

What are the names of all of the renewable resources?

Sources of Renewable energy-

1. Biomass (Wood, forest and agricultural wastes, domestic sewage, industrial waste)

2. Solar Energy (Photo-voltaics and Solar Thermal)

3. Wind Energy (wind turbines)

4. Hydro Power (Rivers, waves and tides)

5. Geothermal Energy (This is the energy tapped from the heat inside the earth)

Water is also a renewable resource, as is wheat, rice, potatoes and other crops.

Renewable Energy

Advantages and disadvantages of conventional energy?

there is no comments from my side

Environmental Issues
Renewable Energy
Green Living

What are some non-renewable resources?

Gasoline Oil Coal Petroleum Basically any natural resource that cannot be produced, re-grown, regenerated, or reused on a scale which can sustain its consumption rate.
Coal, oil.
oil, coal, natural gas, and uranium
Gasoline, precious gems, gold...
Oil and coal.
coal,minerals,oil,diesel,nuclear energy

sorry that's all i got!
Examples of nonrenewable resources would be coal, oil, gas and nuclear fuel like uranium.

These fuels are nonrenewable because they once you burn them or use them they can't be used again.

Anything that's mined from the Earth.

In the field of energy, that includes:

  • coal
  • lignite
  • oil
  • natural gas
  • shale oil

In the field of materials,

  • sand and gravel
  • gold
  • diamonds
  • iron ore
  • bauxite

The only non-renewable resources are ones that cannot be replaced, or at least replenished as quickly as it would be consumed. Hardwoods would be an example, if you don't replant them. Generally this is applied to fossil fuels : coal, oil, and natural gas, which would take millions of years to replace, and not quickly enough to replace what is used.

Simple, fossil fuels like petroleum and all oil related things

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