Snapquiz - Transformers

Question 1. How can we induce a current in a conductor?

Move the conductor relative to a magnetic field.
Put the conductor next to a magnet.
Wrap the conductor around a magnet.
Line a conductor up with magnetic field lines.

Question 2. The primary coil has 9000 turns and a potential difference of 15V. The secondary coil has 3000 turns. What is the potential difference in the secondary coil?

10V.
5V.
30V.
45V.

Question 3. What is the benefit of using an AC supply?

The changing current gives us a changing magnetic field.
It's more efficient than DC.
It's safer than DC.
The changing current gives us a stronger magnetic field.

Question 4. What is the benefit of using a core in a transformer?

It makes the transformer more powerful.
It makes the transformer work.
It makes the transformer more efficient.
It makes the transformer heavier.

Question 5. The primary coil has 9000 turns and a current of 2A. The secondary coil has 3000 turns. What is the current in the secondary coil?

0.33A.
4A.
0.67A.
6A.

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