Unit Three: Transformers

Question 1

What do transformers do?

Answer 1

Change the potential difference - but only AC (altering current) potential difference

Question 2

Name the two different types of transformer:

What do they do?

Answer 2

Step up and step down transformers

Step up -
•step the voltage up
•they have more turns on the secondary coil than the primary coil

Step down -
•step the voltage down
•they have more turns on the primary coil than the secondary coil

Question 3

How do transformers work?

Answer 3

By electromagnetic induction

Question 4

What does the primary coil do?

Answer 4

Produces a magnetic field which stays within the iron core, meaning that nearly all of it passes through the secondary coil and hardly any is lost