Notes
The motor and generator
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The electric motor
As the current passes around the loop of wire one side of the loop will experience an upward force and the other a downward one - it rotates. The split ring causes the connections to the supply through the brushes to swap over when the loop is vertical - the current flowing through each side of the loop changes direction.
The wire at the top is pushed downwards and the wire at the bottom is pushed upwards - the loop carries on turning.
* The arrangement of the brushes and the split ring changes the direction of the current flowing through the loop every half turn - ensures continuous rotation.
The generator:
As the coil rotates its wires cut through the magnetic field lines - current is induced.
The wires move up through the field and down for each turn of the coil - current induced flows in one direction and then the other (alternating current - produced by an alternator).
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- IGCSE Physics Note on The motor and generator, created by Caitlin Yao on 03/03/2018.
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- Caitlin Yao
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