P7

Question 1

What can a Transformer do?

Answer 1

Change the voltage of a wire carrying alternate current

Question 2

What is Flemings left hand rule?

Answer 2

Thumb = Magnetic field
First finger = Force
Second finger = Current

Question 3

What is the right hand rule?

Answer 3

Thumb = Current
Rest of fingers = Magnetic field

Question 4

Nama component of a Transformer?

Answer 4

Iron core

Question 5

What happens for a Step up transformers?

Answer 5

Secondary coil has more turns than the primary coil
Secondary coil pd of secondary coil is greater than pd across primary coil

Question 6

What happens for a Step up transformer

Answer 6

Secondary coil has fewer turns than a primary coil
Secondary coil has a smaller pd than the primary coil

Question 7

Vp/Vs = ?

Answer 7

np/ns

Question 8

VsIs =

Answer 8

VpIp

Question 9

Explain how the charger of an electric toothbrush works

Answer 9

Alternating pd
AC generated in Secondary coil
Changing magnetic field secondary coil
This induces Apd in secondary coil
Apd produces AC in the secondary coil