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There shouldn't be any radial force to keep a generator turning.
Energy is force * distance, and power is energy/time.
So if you have a 1 metre radius drive wheel on the turbine and a force of 1 newton at the edge pushing it around then the energy for each turn will be 2*pi*1 = 6.3 Joules, if you turn it once/second you will get 6.3Watts.
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