about $0.04 per Kilowatt in PA
There is the yanzte river bridge
i think that is near the 3 gorges dam anyway!
hope i helped Sarah
answ2. Hydroelectric dams are temporary features. They will eventually fill up with gravel and silt from the river. This is very expensive to remove.
Otherwise the maintenance is things like removal of debris that may damage the turbines. The actual maintenance of turbines and generators is small - occasionally bearings need replacement and so on. Pretty minimal overall.
Hydroelectricicity is expensive to install, but the annual running costs are very small.
well, hydro electricity is water that falls into the blades of turbines and moves the turbines to make electricity.
Some advantages are that it is reliable, i am pretty sure it is renewable, it does not pollute the earth, and it is a natural resource.
Some disadvantages are that if it is not cared of properly then it may flood and kill wildlife, and i think it costs alot of money.
You will need a water reservoir, some form of turbine, and something connected to the turbine to represent a generator.
The water reservoir can be just about anything that can contain water at an elevation above that of your turbine. In the real world, this is usually a dam, so you may want to model something that looks like a dam.
Water from the elevated source is allowed to flow from the source past a water turbine. You could make a waterfall and paddlewheel so that people can see the workings, but in an actual generation station, this is a pipe and the turbine is enclosed.
The turbine turns as a result of the water flow. A generator is connected to the shaft of the turbine. You can use a permanent magnet motor for your generator. Just hook up a voltmeter to what would normally be the battery leads of the motor to show the voltage being generated. Chances are, your model won't be able to generate enough power to light a bulb, so showing the voltage with a voltmeter is a simple way of demonstrating the principle.A:We need these things to make a hydroelectric power station:
2.aluminium foil or butter paper
5.a turbine made of plastic
6.a 1.5 volt battery
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.
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.
there are 17 water turbines in the hoover dam, good luck on your homework lazy piece of poo
In addition to ordinary shell type of boiler, there are two general steel boiler classifications, the Fire tube and Water tube boilers
Since hydropower involves the direct change of stored potential kinetic energy into electricity, rather than requiring going through a thermal transfer stage (i.e. heat->kinetic->electric vs kinetic->electric) as in nuclear or geothermal, the "efficiency" of a hydropower plant is certainly higher than a nuclear or geothermal plant.
In terms of energy produced per unit of input source (i.e. fuel - water in the case of hydro, steam in the case of geothermal, and fissionable fuel in the case of nuclear), nuclear wins by a massive margin (on the order of millions of times more efficient).
For many centuries water mills were used to grind corn, but obviously not to produce electricity. That has been done since about 1880, ie as long as electricity has been known about.
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.
A hydro dam works by taking the energy of water flow and converting it into an electric voltage. The water is regulated through a series of water turbines. The water flows through the turbine, pushing the turbine blades causing a rotation to a shaft. The shaft is then attached to an electrical generator. Inside the electrical generator, magnets are rotated around wire coil inductors which cause a voltage.
The word 'hydro' means water. When water is stored in a reservoir by construction dam, the stored water will have gravitational potential energy. When water is allowed to flow down this PE is changed into kinetic energy. This KE will make the wheels of a turbine to rotate. This mechanical energy ie rotational energy is changed into electrical energy with the help of magnetic field. This phenomenon is known as electromagnetic induction, first found by Michael Faraday. This is how hydro power is changed into electrical power.
The energy in moving (falling) water, is supplied by gravity, and the moving water has kinetic energy. This mechanical energy is applied to turbine blades, and the turbines turn electric generators to generate electricity.
Hydro power is generated by using kinetic energy from flowing water to turn turbines in generators.
Turbine is moved with flow of water and this is coupled with generator to produce electricity
Hydroelectric power, or hydroelectricity, is generated by the force of falling water. (Hydro comes from the Greek word for water.) It’s one of the cleanest sources of energy, and it’s also the most reliable and costs the least. Water is needed to run a hydroelectric power-generating unit. The water is held behind a dam, forming an artificial lake, or reservoir. The force of the water being released from the reservoir through the dam spins the blades of a giant turbine. The turbine is connected to the generator that makes electricity as it spins. After passing through the turbine, the water flows back into the river on the other side of the dam.
Electricity is produced by spinning electromagnets within a generator’s wire coil that creates a flow of electrons. To keep the electromagnets spinning, hydroelectric stations use falling water. Hydroelectric power plants convert the kinetic energy contained in falling water into electricity. The energy in flowing water is ultimately derived from the sun, and is therefore constantly being renewed. Energy contained in sunlight evaporates water from the oceans and deposits it on land in the form of rain. Differences in land elevation result in rainfall runoff, allowing some of the original solar energy to be captured as hydroelectric power. Most hydroelectric stations use either the natural drop of the river or build a dam across the river to raise the water level and provide the drop needed to create a driving force. Water at the higher level (the forebay,) goes through the intake into a pipe, called a penstock, which carries it down to the turbine. The turbine is a type of water wheel that converts the water's energy into mechanical power. The turbine is connected to a generator, and (4) when the turbine is set in motion it causes the generator to rotate, producing electricity. The falling water, having served its purpose, exits the generating station through the draft tube and the tailrace where it rejoins the river.
At Ontario Power Generation (OPG), hydroelectric generation is their lowest-cost power source, producing approximately 34 terawatt-hours in 2002. OPG operates 36 hydroelectric stations, as well as 29 small hydroelectric plants and 240 dams on 26 river systems. The smallest station has a generating capacity of just 1 megawatt; the largest more than 1,300 megawatts.
What I've been able to find for the Hoover Dam says ~$50 million in the 1930's, today that's roughly $690 million. The entire Boulder Canyon Project cost around $165 million, which included the Hoover Dam.
The Hoover Dam has 17 hydro electric generators, capable of generating 2,074MW, which is quite large. The cost of a hydroelectric dam will be dependent on the river it crosses, the storage lake (how big does it need to be, is it man made, or already present, etc.), and how big it will be (how much electricity can it generate), and a host of other factors. I know of a 45MW (enough to power a small town, say 20,000 people) that cost $7.3 million in the 1930's.
around 800 feet high
Hydropower is the cheapest way to generate electricity today. No other energy source, renewable or nonrenewable, can match it. Producing electricity from hydropower is cheap because, once a dam has been built and the equipment installed, the energy source-flowing water-is free.
Although Hydropower does present a few environmental problems the inherent technical, economic and environmental benefits of hydroelectric power make it an important contributor to the future world energy mix,
Gallons per minute, a unit of volumetric flow rate
YES......For obvious reasons=biomass is renewable!=
they stopped using candles, kerosene, oil lamps and fire torches in the late 19th century
Depending on the size and construction, hydroelectric dams can capture up to 90% of the available energy. Smaller generators may provide as little as 50%.
A major consideration is the volume of particulates (silt) impounded by a dam. This may require some energy be allowed to escape.
Both Wind turbines and hydroelectric dams generate energy in close to the same way, in a wind turbine, the powerful, slow spinning blades move a drive shaft that goes through a gearbox that converts the shaft into a faster moving, slightly less powerful shaft. In a hydroelectric dam, falling water moves a drive shaft. This spinning rod then turns a turbine, which turns a generator around (a magnet near coils of wire.) This creates electricty!
The science behind hydroelectric power includes elements of physics. Given an existing dam with a reservoir and a power station, let's follow the action. Water is allowed to build up behind a dam. This creates potential energy. Releasing the water and directing it through turbines converts the potential energy into kinetic energy. This energy, which is mechanical energy, spins the turbines. Call that the "first stage" of the process.
The turbines are coupled to generators, and the mechanical energy of the turbines is converted into electromagnetic energy in those generators. The electromagnetic energy (or just "electricity" if you prefer) is routed to a transformer bank to step it up in voltage. The higher voltages allow for less power loss during transit, and the energy is transported to points of use. There, it is stepped down to relatively "safe" voltages and routed out to electrical equipment and devices.
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