(d) Electromagnetic induction

Electricity can be generated by either moving a magnet inside a coil of wire or rotating a coil inside a permanent magnetic field.

Model answer for a generator (Rotating coil):

·         Coil is rotated within a magnetic field

·         As it turns the coil cuts the magnetic field lines.

·         This induces a voltage (or current) in the coil.

·         This can then be connected to an existing circuit.

·         In a generator, energy is being converted from kinetic (mechanical) energy into electrical energy.

·         The size of the induced voltage (or current) can be increased by:

·         Using a stronger magnet

·         Having more turns in the coil

·         Spinning/moving the coil faster.

Model answer for a generator (Rotating magnet)

·         Magnet is rotated within a coil

·         As it turns the coil cuts the constantly changing magnetic field lines from the magnet.

·         This induces a voltage (or current) in the coil.

·         This can then be connected to an existing circuit.

·         In a generator, energy is being converted from kinetic (mechanical) energy into electrical energy.

·         The size of the induced voltage (or current) can be increased by:

·         Using a stronger magnet

·         Having more turns in the coil

·         Spinning/moving the magnet faster.