Answer:
C) By exposing a coil of wire to a changing magnetic field
Step-by-step explanation:
An electrical generator creates electricity by exposing a coil of wire to changing magnetic field.
The generator converts mechanical energy which the energy due to the motion of a body and this produces electrical currents.
- In the presence of a magnetic field electric current is induced within the circuit.
- The mechanical energy is obtained from an external source and sustained by the turning of the pistons with the set up.
- This keeps the generator in constant motion and through the magnetic fields.