Question

Most electrical power generation (except for solar) converts motion into electricity using a generator. The two required components for a generator are
A) a turbine and a source of electrons to move.
B) an armature free to spin and a permanent field magnet,
C) a coil of wire and a magnet in relative motion to induce an electric current.
D) two coils of wire connected by an iron core to create changing electric fields.

Answer 1

The correct answer is
a coil of wire free to spin in a permanent magnetic field

In fact, an ac generator consists of a coil of wire spinning in a permanent magnetic field. Due to the rotation of the coil, the magnetix flux through its area changes with time, and for Faraday-Neumann-Lenz law this change of flux induces an emf in the coil. This emf produces an induced current in the coil, so the initial energy of motion has been converted into electrical energy (current)

Answer 2

the answer is c: a coil of wire and a magnet in relative motion to induce an electric current