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In order to collect enough energy from the wind to make any generator practical, the turbine (or propeller) needs to be pretty good sized. You can see this for yourself at any of the wind farms currently operating; typically, the turbine itself is at least 100 feet in diameter. Propellers are limited in their speed by how fast the tip of the blades travel through the air. If the tip starts to get close to the speed of sound, the blade's efficiency drops dramatically, added with the chance of mechanical damage from the severe buffetting that's encountered. Thus, we regulate the blade's speed to stay below this point by changing the angle of the blades through the use of a governor. Conversely, most generators available nowadays are built as small as possible to keep overall weight and rotating mass at a minimum. Also, the more iron in the core, the more energy is lost through heat. Therefore, to get the expected amount of energy from these requires a relatively high rpm as compared to what's being produced by the propeller on our windmill. Therefore, to be able to mate the two together, we have to increase the propeller's rpm of, say, 30 rpm, up to where the generator needs to be, which can run any where from 1800 rpm to over 3600 or more. Nathan
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∙ 15y ago
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How many wind turbines does a village need?
it depends on how much electricity the village requires
What does a photoelectric need to produce electricity?
a photovolatic cell
How is hydroelectricity gathered?
The water runs through turbines and, this mechanical energy is transfered to generator which inturn is transfered into electricity for homes, businesses, and other things that need electricity.
Why is oil burnt in power stations?
The whole idea of a "power station" is to produce energy. They need to get the energy from somewhere. Burning oil is one alternative to get their energy.
What does a nuclear power plant need to produce electricity?
Through machinesMy answer is short and simple, although not as much as the first one, lol. Nuclear power plants create electricity much the same as any other power plant the difference is the fuel used. The nuclear fission is the energy used to heat water that creates steam to turn a turbine which generates electricity.
What kind of fossil fuel do wind turbines need to produce electricity?
You obviously don't understand what fossil fuels are-coal, oil, natural gas. Wind turbines don't need any of these to produce electricity
Is dams built on rivers to produce electricity?
Because you need running water to spin the turbines to create electricity in a hydro plant.
How many wind turbines does a village need?
it depends on how much electricity the village requires
Is hydro electricity sustainable?
Yes because hydro-electricity relies on turbines which need to be turned round. In most cases, it is made from dams(made on rivers), which relies on water passing through it to turn the turbines.
What are the disadvanteges of wind turbines?
The wind blows at a variety of speeds. The turbines need to produce electricity at a standard voltage. If the blades speed up and slow down as the wind changes speed the voltage will vary. They are hard to get right that way. They are placed in windy areas which is where birds fly. If they go too fast, they will kill a number of birds and thus be bad for the environment. The noise from the turbines can be unpleasant.
What we need to produce nuclear electricity?
steam turbine
What does a photoelectric need to produce electricity?
a photovolatic cell
Is it better to have a larger wind turbines?
It depends on how much electricity you need. But yes of course, a larger wind turbine traps more energy between its blades, so it is "better" in terms of how much electricity produced. However, if you think about it in terms of other things: 1. Sight pollution Larger wind turbines produce more sight pollution than small ones. 2. Animals Large wind turbines kill all birds or bats that fly into them but small ones don't.
How is hydroelectricity gathered?
The water runs through turbines and, this mechanical energy is transfered to generator which inturn is transfered into electricity for homes, businesses, and other things that need electricity.
How many wind turbines do you need to run a city?
A 1MW wind turbine will produce enough electricity to power 1,500 average sized homes. Because wind is not a constant, wind turbines are a secondary source of electricity and will never replace other sources. This being their big drawback. London by has 8,000,000 residents. If you were to assume 2 residents per household, that would be 4 million homes. Requiring 2,667 1MW turbines. 10,000 to run the city. 12-15,000, to run NYC. Vestas, the largest maufactures of wind turbines has capacities of 1-3MW. Which means 3,000 for London, and 5,000 for NYC, respectively.
Why is oil burnt in power stations?
The whole idea of a "power station" is to produce energy. They need to get the energy from somewhere. Burning oil is one alternative to get their energy.
When you pass heat which metal will produce electricity?
No single piece of metal will produce electricity when heated. You will need two different metals, mechanically touching. When the join between the metals is heated, it will produce electricity, dependant on the metals used. This is known as a 'thermocouple'.
