What determines the power of a wind turbine?
89951
Just as with any other generator, electrical power is proportional to shaft torque and speed.  A wind turbine generator is designed to operate in a certain speed and torque range.  The design of the turbine and pitching of the blade angle keep it operating in this range.  It's actually wind speed that forces the control of torque/speed up to a certain maximum level, so yes, electrical output is directly coupled to wind speed and energy capture of the wind.  \n\nThe generators in wind turbines do generaly require some amount of excitation current to regulate power output.  This is really what allows wind turbines to operate at different power outputs and not a single fixed rating.
938209
Depends on horse power, weight and whether the wind is blowing or not.
348003
Have a look at http://science.howstuffworks.com/power.htm
355681
I have studied this issue in the past and found the wind powered turbines online through a simple Froogle search.  Here's the link to the Alternative Energy Store:\n\nhttp://shop.altenergystore.com/items.asp?Cc=WINDGEN&CatMoveby=0&Nbm=&Pbm=&FromNav=
325624
You might want to get some help pulling a windmill up, they can weigh several hundred pounds.\n\nSERiously though, try this website that also has a howto forum \n\nhttp://www.otherpower.com/otherpower_wind.html
140612
Yep.  A fan will do the trick, or if it's a vehicle used for a specific purpose (like carrying something from set point A to set point B) a pulley system would work.  I don't know the exact equations involved, but the fan's windpower strength should be (obviously) greater than the mass of the vehicle, and should have some kind of failsafe cutoff switch as well as a means to decrease power to the fan, for (again, obviously) safety reasons.
941868
Just from looking at this, it seems that it can be set up as a ratio:\n\nP1/W1 = P2/W2\n\nwhere Pi and Wi are the power and wind speed, respectively. So for the first one it would be set up like:\n\n(5 kW)/(10 mph) = x/(20 mph)\n\nsolving for x gives us:\n\nx = (5 kw)*(20 mph)/(10 mph)\n= 10 kW\n\nFor the second speed we could set it up like this:\n\n(5 kW)/(10 mph) = x/(25 mph)\n\nonce again we solve for x and get:\n\nx = (5 kW)*(25 mph)/(10 mph)\n= 12.5 kW\n\nI don't know if this is correct, but from the information given this is the only way I can think of to do it.
75638
It's use water to get electricity\nA electricity is produce by turbine , there is a several way to make this turbine working by motor, by wind flow, by water,....\nIn case of water the hogh velocity of water during shut down make the turbin turn and produce electricity
657313
W/m*K = Watt/(meter*Kelvin)\n\nPower per unit length per unit temperature\n\nWhere power is defined as energy per unit time.
115670
A generator is a machine that converts mechanical power to electrical power, by making a conductor cut across a magnetic field's lines of force.  This is done by moving either the conductor or the magnetic field.  Current flows in the conductor if its ends are connected to an electrical load thus producing electrical power.  Because an opposing magnetic field is created by the current in the conductor, it requires mechanical energy to maintain this motion.
1161674
Yes, you can, or more usually they turn themselves off when the wind gets too strong.   The power generated from the wind goes up as the cube of the windspeed.   So a 40 knot wind doesn't generate twice as much power as a 20 knot wind but 2x2x2=8 times as much.   So a fairly strong wind is too much for a wind generator to handle, and to prevent damage it automatically feathers the blades.   That is, it turns them parallel to the wind, so they don't turn.
544463
solar/wind power and electric vehicles. natural, renewable, no pollution, and noone has a monopoly on sunlight and wind.
887212
Brushless generators have a fixed magnetic field which rotates through the AC output windings.  As the engine speed or load varies the output voltage will change.\nGenerators which are not brushless are able to control the magnetic field.  This supplies the ability to introduce a feedback loop to control the output voltage.\nRead my generator FAQ.  It may better answer your question.\nhttp://members.rennlist.org/warren/genfaq.html
73433
a generator is technology based on the scientific phenomenon that is today known as faraday's law.    \n\nif you have a loop of wire and you stick it into a magnetic field, well, then you'll have a loop in a magnetic field.  no big deal.  but if you then do something that changes the magnetic field somehow - either by changing the strength of the field, or its orientation relative to the loop - then if you are paying attention to such things you will notice that there is suddenly a current flowing in the wire.  and when you stop moving the field around, the current stops flowing.  faraday's law is a mathematical statement of this observed natural phenomenon, which is called induction.\n\nanyway, a generator is a thing that uses induction to convert mechanical energy to electrical energy.  it is basically what i just said - some big permanent magnets arranged such that there is a region of space with a strong magnetic field between them - and some big coil of wire in the middle.  \n\nthis coil is attached to a rod which leads out of the device and to a handle, or gears, or engine or turbine, or basically some -thing- that makes it spin.  the mechanical energy of the spinning is then converted into electrical energy, which drives the current in the loop, and powers whatever electrical device the two ends of the loop are attached to!\n\nand, basically that's it.  because the coil goes around and around, the current flows back and forth in a sine-wave pattern, and that's why generators are used for making alternating current, which is what is in the power grid and the walls of your house.\n\nnote that an electric motor is essentially a generator that operates in reverse - you connect some driving AC voltage to the coils, and the changing current causes a magnetic field to form which opposes that of the permanent magnets, so (as anyone who has ever played with magnets will tell you) there is a considerably strong force that pushes the coil away from the magnet.  with proper design you can make it keep pushing itself all the way around a circle, and voila, you have a motor.
847606
A winmill does not generate energy.\nthe country of windmills is Holland
43721
There are too many variables to be able to accurately answer this question.  There are many different types of helicopters with different sizes of power plants.  External factors such as the load being carried, wind speed, etc. also contribute to how much fuel will be used.
368150
if you want a huge turbine in your back yard, you could try using the wind for your energy