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?

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


Question 2. Which substance can we place inside an electromagnet to make it stronger?

Copper.
Aluminium.
Iron.
Gold.


Question 3. The primary coil has 1000 turns and a current of 2A. The secondary coil has 4000 turns. What is the current in the secondary coil?

2A.
8A.
16A.
0.5A.


Question 4. Why do we step down the potential difference for for use in our homes?

It reduces electricity bills.
It causes less current to flow.
It's safer.
It's more efficient.


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

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


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