Snapquiz - Transformers

Question 1. Why do we step up the potential difference for transmitting electricity?

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

Question 2. 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 3. Which of the following is not an advantage of switch mode transformers?

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

Question 4. 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 powerful.
It makes the transformer more efficient.

Question 5. What is the benefit of using an AC supply?

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

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