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. 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.
6A.
0.67A.
4A.


Question 2. How can we induce a current in a conductor?

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


Question 3. Why do we step up the potential difference for transmitting electricity?

It's to stop people tampering with the cables.
It's safer.
It causes more current to flow.
It's more efficient.


Question 4. Which substance can we place inside an electromagnet to make it stronger?

Aluminium.
Gold.
Iron.
Copper.


Question 5. What is the benefit of using an AC supply?

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


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