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greeting .

How much mechanical energy (power) is converted to electrical potential to have output voltage (no load connected)?

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closed as unclear what you're asking by pjc50, Harry Svensson, Michel Keijzers, Neil_UK, RoyC Mar 29 '18 at 13:58

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    \$\begingroup\$ Zero. As told to you in physics class during the laws of thermodynamics session. \$\endgroup\$ – winny Mar 29 '18 at 11:37
  • \$\begingroup\$ In order for voltage to be produced, the electrical generator must have a magnetic field. If that field is produced electrically, the required power must be either converted from mechanical power or supplied from some other generator. That is a small percentage of the capacity of the generator. Additional mechanical power is required to keep the system in motion, but that power is converted to heat rather than electrical power. \$\endgroup\$ – Charles Cowie Mar 29 '18 at 14:19
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Zero.

Think of it like a fully charged battery with out any load attached. The chemical energy in battery is limited and can be converted into a definite amount of electrical energy. But when no loads are connected, how much chemical energy is converted to electrical energy? None.

Similarly, when no loads are attached to a generator, no mechanical energy is being converted to electrical energy. Efficiency of the generator is zero. Whatever mechanical energy is being consumed is being spent to overcome friction, windage and intertia.

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