Electromagnetic Induction

Question 1

Back Emf

Answer 1

An emf generated by the coil in an AC generator that acts against the potential difference that has been supplied to the motor

Question 2

Electromagnetic Induction

Answer 2

When an Emf is induced in a wire/ conducting rod when it is moved relative to the magnetic field

Question 3

Faraday’s Law

Answer 3

The magnitude of the induced emf is equal to the rate of change of flux linkage through the circuit

Question 4

Lenz’s law

Answer 4

An induced current is always in a direction so as to oppose the change that caused it

Question 5

Step-down Transformer

Answer 5

A device made of two insulated wires coiled around an iron core in which the output voltage is smaller than input voltage due to the secondary coil having fewer turns than the primary coil

Question 6

Step-up transformer

Answer 6

A device made up of two insulated wires coiled around an iron core in which the output voltage is greater than the input voltage due to the secondary coil having more turns than the primary coil