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

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


Question 2. Why do we step up the potential difference for transmitting electricity?

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


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?

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


Question 4. Why are transformers used for shaver outlets in bathrooms?

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


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?

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


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