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I am trying to fine out how much power/work my little turbine will do. Do I need to add together the rotary KE and the PE to get the power.

...In practice, however, some work is always wasted in overcoming friction and raising moving parts, and therefore the useful work done by a machine is always less than the work done by the effort.

... I have attached a small generator to the turbine and it generates 6.5 watts but then I need to work out the efficiency of the generator, looking at the technical details of the generator I think it is about 50% efficient ...

Hi RD and many thanks for the reply.Yes I know the wind speed and the power in the wind at the wind speed, I am also aware of the Betz 59% limit.But what I have read under kinetic and potential energy of motion is.KE stands for kinetic energy and I under stand that. (Note that a change in the velocity will have a much greater effect on the amount of kinetic energy because that term is squared. The total amount of mechanical energy in a system is the sum of both potential and kinetic energy, also measured in Joules (J).Total Mechanical Energy = Potential Energy + Kinetic Energy If I know the kinetic energy as rotation where is the potential energy is it the mass you have lifted waiting to fall.Many thanks Happy Mark

...They all count the total voltage and amps for their rating not the voltage gain times amps. what should be the correct method for the power of a turbine.