Snapquiz - Transformers

Question 1. 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.

Question 2. Why do we step up the potential difference for transmitting electricity?

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

Question 3. Which of the following is not an advantage of switch mode transformers?

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

Question 4. 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?

32V.
64V.
2V.
16V.

Question 5. How can we induce a current in a conductor?

Move the conductor relative to a magnetic field.
Wrap the conductor around a magnet.
Put the conductor next to a magnet.
Line a conductor up with magnetic field lines.

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