Electromagnetic Induction Quiz

The diagram shows a transformer with 100 V a.c. applied to the primary coil. What is the potential difference (voltage) across the secondary coil?

• 50 V

• 100 V

• 200 V

• 800 V

The figure shows a bar magnet being pushed into a coil of wire. Which of the following?

• End Q becomes N – pole

• End P becomes S – pole

• Current will follow in the direction show

• The arrangement could be called generator

A transformer is used to change

• alternating current to alternating current of a different magnitude

• alternating current to constant direct current of the same magnitude

• constant direct current to constant direct current of a different magnitude

• constant direct current to alternating current of the same magnitude

A) write TWO sentences to explain how we could generate alternating current using the equipment shown below:

B) When you generate electricity using this equipment what do you see when you look at the galvanometer needle?

i. Why is it a ‘step down ‘transformer?

ii. The value of the current flowing through the lamp is .....................

iii. The voltage across the lamp is ...........................

The movement generates electricity known as

b) The induced emf (voltage) in the circuit can be increased if: