Power and coil rotation

Question

Suppose that there is a single generator providing power to your house. Right now, the wire coil is spinning at a certain number of rpms within a magnetic field, generating current via Faraday's Law.

If you turn on a light in your house, you are requesting additional power from this generator. Assume that the rate of spinning, its rpms, doesn't change.

a) Does the voltage or the current (or both) supplied by the generator change when you flip the lightswitch? Explain how you know.

b) Where does that additional power come from? Energy is conserved, so somehow the generator must be doing more mechanical work to supply the extra electrical power. What is the physical mechanism that causes the generator to have to work harder to continue spinning that coil?

Would you please help, not sure where to start!

Answer 1

The generator will generate the same voltage since the speed did not change. The Turning on the light will increase the power out Pout = I*V . since the power increases the voltage is the same so the current increases . SO now the big question do we get the extra power for free. Sorry no the extra power has to come from the energy source which is turning the generator. The force to maintain the speed of the generator will increase or the torque on the generator goes up.