Pages in this set

Page 1

Preview of page 1
Mo t

Unit 3 ii, GCSE


Page 2

Preview of page 2
What is the motor Effect?

If you put two magnets near each other, they will interact
Interact means that the magnets will feel forces on them, as they either repel or attract
A wire which is carrying an electric current has a magnetic field of its own
If this wire…

Page 3

Preview of page 3
Fleming's Left Hand Rule

You can predict which way the force will act and therefore which way the wire will move using this

1. Using your left hand, point with your first finger in the direction of the field from the permanent
2. Point with your second finger…

Page 4

Preview of page 4
Motor Effect Changes

If we reverse the direction of the current, the magnetic force of the wire reverses, which in turn
means that the force reverses too
If you use an alternating current, the force will constantly be changing direction, so the wire will
be seen as vibrating
The force…

Page 5

Preview of page 5
Use Fleming's Left Hand rule, and you will see that the left hand part of the coil (where the
current is flowing towards you) will experience a force upwards
The right hand part of the coil (where the current is flowing away from you) will experience a
force downwards


Page 6

Preview of page 6
Parts of the Electric Motor

1. A permanent magnet
2. Armature or rotor
This consists of a thin copper wire coiled around an iron core, hence when electric current
flows it acts as an electromagnet. In the case of a simple motor this is a wire loop.
3. Commutator

Page 7

Preview of page 7
NOTE: A good website to see animations of how the electric motor and its parts work is

Ways to Speed up an Electric Motor

Increase the current ­ so that the wire's field is stronger, and so the force is stronger
By having a stronger permanent magnet ­ so…


No comments have yet been made

Similar Physics resources:

See all Physics resources »