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. 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?


Question 2. Why are transformers used for shaver outlets in bathrooms?

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

Question 3. The primary coil has 1000 turns and a potential difference of 8V. The secondary coil has 4000 turns. What is the potential difference in the secondary coil?


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

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

Question 5. Why do we step down the potential difference for for use in our homes?

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

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