# The Motor Effect

This is a word document about the motor effect and has literally everything I think we would need to know for the Unit 3 Physics AQA GCSE. I hope this is useful, and for everyone doing the exam on wednesday - best of luck! :)

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• Created by: Nicola
• Created on: 28-05-12 11:51
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## Pages in this set

The
Mo t
or
Ef
fect

Unit 3 ii, GCSE
Physics

Nicola

### 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

Fleming's Left Hand Rule

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

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

### 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

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

As…

### 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
A…

### Page 7

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

http://passmyexams.co.uk/GCSE/physics/electric-motors.html#1

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…