When a generator produces electricity?

A generator produces electricity

a. whenever a wire cuts through a magnetic field.
b. when the voltage is as high as the amps.
c. when two opposite poles of a magnet come together.

Plz explain your answer!

2 Responses to “When a generator produces electricity?”

mark p Says:
21. April 2010 at 11:06 am

The answer is a). When a wire cuts through a magnetic field (technically, a loop of wire) current is generated in the loop.

b. makes no sense. A generator can certainly produce 120V at 1Amp.

c doesn’t really make sense either. You can stick two magnets together (which, by definition is an N and S pole coming together) and leave them there forever, and you won’t be generating any electricity (which is too bad, since otherwise you’d have a perpetual motion machine!)

truth_saker Says:
21. April 2010 at 11:06 am

the correct answer is a.
according to Faraday’s law and which states that an electric field can be produced from changing magnetic field, and when a wire cuts orthogonally the magnetic field lines the wire senses a changing magnetic field and it will pass a current through it.
this is how generators work.