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

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

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

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

Question 3. Which substance can we place inside an electromagnet to make it stronger?


Question 4. What is the benefit of using an AC supply?

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

Question 5. 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?


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