Snapquiz - Transformers

Question 1. 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 cheap.
They're low frequency.

Question 2. How does a transformer produce a current in a secondary coil?

It's induced by the field produced by the primary coil.
The core conducts the current to the secondary coil.
It's induced by the field produced by the secondary coil.
The primary coil is electrically connected to the secondary coil.

Question 3. Why do we step down the potential difference for for use in our homes?

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

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?

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

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

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