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 potential difference of 15V. The secondary coil has 3000 turns. What is the potential difference in the secondary coil?

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


Question 2. Why do we step down the potential difference for for use in our homes?

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


Question 3. Which of the following is not an advantage of switch mode transformers?

They draw almost no power when not in use.
They're low frequency.
They're small and light.
They're cheap.


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.
6A.
0.33A.
4A.


Question 5. 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's safer.
It causes more current to flow.


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