Electric motors Flashcards

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1
Q

What angle must a current carrying wire be placed to the lines of a magnetic field to experience a force?

A

It must be placed at a right angle to the magnetic field lines, if placed parallel the current carrying wire experiences no force

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2
Q

How does a motor turn?

A

When a current flows in a wire through a magnetic field, the wire experiences a force and if its free to move, it will. This is the motor effect.

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3
Q

What is the job of a commutator in a motor?

A

In a motor, one side of the current carrying circuit will be pushed upwards and the other downwards creating a circular motion, but to ensure the circuit turns at the top of each push from the magnet, a commutator turns the circuit at the correct time in the revolution, maintaining the motor’s turning

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4
Q

What devices and domestic appliances use motors?

A

DVD players, hard disc drives, electric motor vehicles, whisks etc.

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