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?


Question 2. 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?


Question 3. Why are transformers used for shaver outlets in bathrooms?

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

Question 4. Which of the following is not an advantage of switch mode transformers?

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

Question 5. Why do we step down the potential difference for for use in our homes?

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

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