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

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

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. Which substance can we place inside an electromagnet to make it stronger?


Question 4. Why are transformers used for shaver outlets in bathrooms?

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

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

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

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