Transformers

Question 0

Complete the statement with these words:
Current, magnetic field, pd, primary, secondary

In a transformer, an alternating ________ is passed through the ________ coil. This coil creates an alternating ________ that passes through the ________ coil. As a result, an alternating ________ is induced in the ________ coil.

Answer 0

In a transformer, an alternating current is passed through the primary coil. This coil creates an alternating magnetic field that passes through the secondary coil. As a result, an alternating pd is induced in the secondary coil.

Question 1

Why does a transformer not work with direct current?

Answer 1

A changing magnetic field is necessary to induce ac in the secondary coil.

Question 2

Why is it important that the coil wires of a transformer are insulated?

Answer 2

If they were, the current would pass through the iron core and there would be no change in potential difference.

Question 3

Why is the core of a transformer made of iron?

Answer 3

It does not retain it’s magnetic charge when the magnetic field is reduced.
It can withstand very strong magnetic fields