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. What is the benefit of using an AC supply?

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


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

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


Question 3. 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?

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


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

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


Question 5. What is the benefit of using a core in a transformer?

It makes the transformer heavier.
It makes the transformer more efficient.
It makes the transformer work.
It makes the transformer more powerful.


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