Generator Effect, EM Induction and Transformers - Paper 2

Question 1

What is the generator effect?

Answer 1

The induction of a potential difference in a conductor experiencing a change in magnetic field
(Electromagnetic induction)

Question 2

Electromagnetic induction is also known as what effect?

Answer 2

The generator effect

Question 3

How does a transformer work?

Answer 3

Primary voltage drives AC through primary coil
This creates an alternating magnetic field
The iron core is easily magnetised and increases the strength of the magnetic field, allowing it to be experienced by the secondary coil
Potential difference is induced there which produces AC in that circuit

Question 4

Which current does a transformer need?

Answer 4

AC

Question 5

What does the core of a transformer need to be made from?

Answer 5

A magnetic material (like iron) which is easily magnetised

Question 6

What is the function of a transformer?

Answer 6

To change the voltage of an alternating current

Question 7

How is a voltage produced on a transformer’s secondary coil?

Answer 7

The secondary coil experiences the changing magnetic field from the AC in the primary coil, inducing a voltage

Question 8

What kind of transformer converts 230,000 V into 11,500 V?

Answer 8

Step-down

Question 9

Why do National Grid overhead transmission cables use very high voltages?

Answer 9

Higher voltages mean lower currents which waste less energy