Motoring-P6
- Created by: Shannon
- Created on: 30-05-13 09:28
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- Motoring
- The direction of the field around a wire can be found using the right hand grip rule
- When a wire is placed between the poles of a magnet, it moves when the current is switched on
- If the current is reversed, it moves in the opposite direction
- The field of a long coil of wire is similar to a bar magnet
- When a current passes through a coil, there is a force on each side of it
- Forces on each side are in opposite directions: the coil starts to spin
- The motor spins faster when there are more turns on the coil, and the current/ magnetic field strength are increased
- The job of the commutator is to keep the motor spinning
- The direction of the coil is reversed every half turn: the force on the coil is always in the same direction
- A radical field increases the force on the coil and keeps it constant as the motor turns
- Magnets in practical motors have curved poles to give a radical magnetic field
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