describe the basic condition necessary to produce a current in a circuit without a voltage source and list the

Question

3 methods of meeting this condition

Answer 1

Three methods? I can only think of one. If you run a closed loop of wire (circuit) through a magnetic field you will induce a current. I believe this is called Faraday's Law, but I am not sure. There might be other ways, such as attaching a transducer onto the circuit and transforming some other type of energy, such as sound energy, into a current. That is how a microphone works, although the amount of produced electricity is very small.

Answer 2

so hows the homework comming?