Snapquiz - Transformers

This is the Snapquiz on Transformers. Click here or use the embedded video if you haven't watched the lesson yet.


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

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


Question 2. What is the benefit of using an AC supply?

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


Question 3. 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?

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


Question 4. 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?

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


Question 5. Why are transformers used for shaver outlets in bathrooms?

They isolate the electrical supply, making them safer.
They increase the efficiency of the supply, saving money.
They step down the electrical supply, making it higher current.
They step up the electrical supply, making it higher voltage.


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