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Public Utilities
Energy can be obtained from various sources: renewable (solar energy) and nonrenewable (coal and natural gas). These sources are needed to produce electricity. Electricity, water, and telephone services are provided to the public by utility services companies.
883 Questions
How can you find out what child protective service is looking for when they do a home study?
I have been a CPS worker for 4 years. When we do home assessments, the main things we are looking for are food, electricity and water. We have to make sure that the environment of the home is suitable for the care of the child, and that he/she will have their basic care needs met there. We mat also ask to see where the child sleeps, and if he/she is a baby, to see diapers, formula, a crib/bassinet, etc.
A refinery makes money by taking raw oil and converting it into other petroleum products, such as gas and kerosene. By selling these refined products, they make money.
Which African country has a considerable petroleum?
Lybia followed by Nigeria, followed by Algeria and then Angola
See link bellow:
How does a Coal Power station produce electricity?
When can a landlord turn off power to evict you?
I believe so, but under certain cercumstances,.. have you been upright in your current bills?
What is the average cost of a water bill for a two bedroom apartment?
We live in a 850 sq ft. house (~10 yrs old) that we pay $900/month in rent(which is really good deal for living west of downtown). On average we pay $180 for our utilities. Our gas bill fluctuates from around $30-50 in the summer to about $100-$120 in the winter. And we split our water/sewer bill 50%-50% with our landlord (most water/sewer is included in rent). Gas is by Unisource Energy Services, and electric is by APS.
Great college town to live in, full of live music and plenty of recreation!
How much is the water bill for a two bedroom apartment?
Water bills vary depending on where you live (utility rates vary from city to city) and how much water you use. You may expect to pay as little as $15 - $20 a month in some cases or as much as $100 or more in others.
What is the NWE Platts price for today?
The price is going to vary for each day depending on supply and demand. You can visit the New York Stocks page to see the most recent data.
What was the price of gasoline in 1936?
Average .20/Gal. I found that it was 10 cents per gallon. and the average laborers work was 20.00 per week. the average new house price was 530.00 aveage cost for house rent was 18.00 per month, average wages per year was 1,550.00 have a good day !!
What is the platt's price for d2 diesel today?
It moves up and down with the market, and the price quote is given in numerous places. The dominant Platt quote is for North Western Europe (NWE), used to be known a "Rotterdam Platt". This is given in US dollars per metric tons.
For the US market, there is a Platt quote for new York harbor, and the Mexican Gulf, in US $ per gallons. Just for the fun of it, the oil companies assumes that there is 304 gallons per MT.
The quantity traded is assumed to be 5000MT or a barge.
The Platt quotes are published by Wiley and is actually not the price of the commodity D2 Gasoil, but for the future option. Futures are traded for deliveries to be done and is used by the banks to split the profit or loss made on commodity traded on long term contracts. The pertinent question to raise is then if the Platt price quoted is formed by the banks to meet their "bets" on expected price, or actually determined by variation in supply and demand for a product.
There are a number of sites that provide the price quote. You need a paid subscription to receive the quote from Platt. The alternative is to look at bunker-prices (ship'd fuel) world wide. These bunker prices are what ship-owers pay for 1 MT of "MDO" or "MGO" - Marine Diesel Oil/ Marine Gas Oil. The other bunker fuels are furnace oils such as CST180
Does nuclear power produce radioactive waste?
Yes. It is contained in the spent fuel rods, which when they have been used too much to be useful anymore are removed from the reactor and stored in a large pool of water to keep them cool until most of the radioactivity has decayed (the energy released in radioactive decay could heat them hot enough to melt if they were not cooled). They were then supposed to be removed from the temporary storage pool and shipped to a long term storage facility or a reprocessing plant, but the US has built neither so the spent fuel rods remain in the temporary storage pools.
Also coal fired plants produce and release coal waste, which includes radioactive uranium oxides in the smoke (nuclear power plants do not release their wastes).
Yes but you can negotiate with house owner.
A National Grid is a power or energy supply system for a nation. They are called this because the network of supply lines from various generating or storage sources forms a grid in a mathematical sense, as there is usually more than one supply line to most points (or grid nodes). This allows some redundancy in the system, to allow continuous supply despite temporary breakdowns on some parts of the grid.
National grids do not necessarily cover the entire country, especially in poorer or less populated areas.
The United Kingdom has a grid for the supply of gas and a grid for the supply of electricity.
The United States has three separate electricity grids, however they are not interconnected.
Australia has a National Electricity Market (NEM) based on a transmission grid connecting the eastern states of Queensland, NSW, Victoria, Tasmania and South Australia, however the distance to Western Australia means that it operates its own South West Interconnected System (SWIS).
How much power is in a 120V line?
Most 120 Volt appliances have their Watts listed somewhere on the appliance. Divide this number by 1,000 to get kilowatts. Determine the rate you are charged for electric power. Your electric bill will tell you how many kWh(kilowatt hours) you use, and what the total charge is. Divide your total charge ($?) by the kWh used. In northern Illinois, we are charged about $0.11 per kWh. Multiply the number of hours the appliance is used by its power consumption in kilowatts. This gives you the number of kWh the appliance used. Then multiply that kWh value by the rate for your area that you determined from your electric bill. That will be the cost for the number of hours the appliance was on.
Example: If I toast 2 slices of bread in my toaster, it takes about 3 minutes, or 0.05 hours. My electric bill is $61.38 and I used 558 kwh for that month. Dividing $61.38 by 558, I get about $0.11 per kWh. So, I divide my toaster Wattage (750) by 1,000 to get 0.75 kW. So now I can multiply the hours that the appliance was used (0.05) by its power consumption rate in kW (0.75). This result is 0.0375 kWh of energy used. Then I can multiply the rate the electric company charges ($0.11) by the energy used (0.0375 kWh). The final result is $0.004125.
What is the unit of measure for reactive power?
Volt Amps [volts times amps] is used for reactive and apparent power. Watts (dimensionally the same as volt amps) is used to indicate real power.
AnswerReactive power is measured in reactive volt amperes (var).
Why can't the equipment used to drill for oil be used to drill into the mantle?
Because oil is in the crust, scientists never drilled to the mantle so far because it is too deep for them.
Why would it be advisable for a householder to remain connected to the national grid?
So that, as a user of electricity, he or she does not have to rely on only one local power generating station.
A National Grid is a network of electricity supply lines carrying power from various generating stations There is usually more than one supply line to most points (or grid nodes), from more than one generating station.
So, by using a National Grid, users can continue to receive power from the other power stations in the network whenever a power station or a distribution sub-station has to be taken out of service for maintenance work or when some power lines are destroyed by bad weather.
How much does and oil tanker weigh?
The weight of an oil tanker can vary depending on its size and capacity. On average, an oil tanker can weigh anywhere from 50,000 to 500,000 tons when fully loaded with oil.
What are the advantages of three phase to single phase electric power distribution systems?
This Answer is the same as the for the Question 'Why is power for a country's mains grid usually generated as 3-phase electricity not single phase?'
Single phase power has a sine wave voltage that crosses zero before reversing its polarity. In the region near the zero-crossing there is not much power. At zero there is none at all. So single phase loads often need some trickery to deliver output in this area. Often it is just the inertia of the motor or appliance.
Three phase power is always delivering power on one of its phases, and is thus preferred for machines, motors and appliances that use lots of power.
Three phase power generation is preferred if the application needs very high power, or nees relatively small power output but with with weight restrictions - as in automobiles, where the power is generated in a 3-phase alternator and then converted to DC using rectifiers!
Use of DC (Direct Current) is the next step up for smooth high-power devices but requires rectification, regulation and smoothing to be useful.
Another problem with DC is that, for efficient long distance transmission, it cannot be simply converted to much higher voltages than the voltage at which it was generated at the power station.
Similarly DC cannot - simply by using transformers - be converted down to safer, much lower AC mains voltages for use by consumers.
Conversion of DC to AC requires the use of expensive high-power electronic "power inverter" systems and the opposite - the conversion of high-power AC to DC - requires the use of very big power rectifiers.
AC (Alternating Current) is used for high power generation and distribution because it can easily be transformed, using transformers, to achieve very efficient power transmission over very long distances and can then be transformed down to low voltages for distribution to consumers.
Two phase, and higher multi-phases are also used, but very rarely, for a few very specialised applications.
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A three phase system provides constant torque, whereas single phase does not.
With three phase you will get more power per kilogram of metal to generate electrical energy.
AnswerFor a given load, a three-phase supply uses less copper than a single-phase system. In other words, it's more economical!
How is the electricity generated in a coal-fired power plant?
Coal is made from dead plants.
In the United States a little about 50%. See http://www.eia.doe.gov for more details.
Simplest version:
Burn the coal, which generates heat. Use the heat to boil water. The steam from the boiling water forces blades on a generator fan to turn, which turns the generator. Electrical current is then produced. This is a gross oversimplification, but you get the point.
More detailed version:
- A machine called a pulverizer grinds the coal into a fine powder.
- The coal powder mixes with hot air, which helps the coal burn more efficiently, and the mixture moves to the furnace.
- The burning coal heats water in a boiler, creating steam.
- Steam released from the boiler powers an engine called a turbine, transforming heat energy from burning coal into mechanical energy that spins the turbine engine.
- The spinning turbine is used to power a generator, a machine that turns mechanical energy into electric energy. This happens when magnets inside a copper coil in the generator spin.
- A condenser cools the steam moving through the turbine. As the steam is condensed, it turns back into water.
- The water returns to the boiler, and the cycle begins again
Coal is burnt and heats water. Water vapor makes a turbine move and generates electricity. When the coal is burnt, poisonous gases are diffused but has no entry in making electricity and pollutes the air.
A coal-fired power station, burns coal to heat water so that it turns into steam. The steam is used to turn turbines. The turbines spin generators which generates electricity. A generator operates by moving coils of wire in a magnetic field, as the wires move, electricity is generated within the wires.
Traditionally, coal is burned to produced heat, gasses, and solid waste. The heat is used to boil water. The steam produced turns a turbine which turns a generator. The generator produces electricity. That technique has an efficiency of 40%. China claims it has developed a technique with 60% efficiency. It will be interesting to find out what it is. China has also claimed that it has discovered an inexpensive way to remove Carbon Dioxide from coal fired electric plants. If so, that is a fantastic break through.
burning coal is used to boil water. The steam the pushes turbine blades, turning the turbine. The turbine is connected to a generator which produces electricity.
-- Coal is burned in air, releasing heat.
-- The heat is used to boil water.
-- The steam is directed through turbine vanes.
-- The turbine spins an electrical generator.
Why is the current kept low in high voltage lines?
Because higher voltage can carry further.
That answer is too simplistic. The actual reason is as follows: for any given load, the higher the supply voltage, the lower the resulting current. Lower currents mean smaller diameter transmission/distribution conductors can be used and the line losses(I2R) are lower.
What is the difference between kva kw kvarh and kvah?
kVA and kW are similar units of power (kiloVoltAmps and kiloWatt), because a watt is volts times amps.
kVAh (or kWh) (kiloVoltAmphours) is the measure of energy: power times unit of time. It is the standard power measurement used by electricity service utility companies.
If a 1kW electric fire is used for 2 hours, it has used 2kWh of energy. A 2kW fire used for 2 hours or a 1kW fire used for 4 hours uses the same amount of energy, 4kWh.
If your device is a pure resistive load then the ac (alternating current) voltage will be used to force the current through the load with a power factor value of 1 (one) and your kVARh will be zero.
If you have a pure inductive load then the voltage will not immediately be able to push the current through the load due to it's very high initial impedance (similar to inertia with a massive object when you push it) but once the current starts to move (its ac cycle rises from zero) the voltage starts to drop off (its ac cycle falls from 100%).
This effect is called the "phase lag" of an inductive load having a power factor of less than 1 and causes some of the kVA being generated at the power station to be wasted - the lower the power factor value, the more the % of kVA that is being wasted. The unused/useless % of kVA must still be generated by the electricity service utility company, even though it is not used, so they have to charge for it as kVARh (kiloVoltAmpsReactivehours).
How do hydroelectric power stations produce electricity?
- Water held high up in the hills behind a dam.
- Pipework drains the lake to a lower level.
- The force of the water in the pipe is used to spin a turbine.
- The turbine is connected to an alternator and produces electricity.
- When it rains the lake is topped up with water.
- During low demand periods, water can be pumped back up to the lake as well, using electricty from other sources.
