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?

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


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?

2A.
16A.
8A.
0.5A.


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?

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


Question 4. How does a transformer produce a current in a secondary coil?

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


Question 5. Why are transformers used for shaver outlets in bathrooms?

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


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