Electromagnetism

How does an Electric Bell Work?

When the switch is pushed closed the circuit is completed
and current flows through the electromagnetic coil.

1. The iron striker is attracted
to the electromagnet and strikes the bell.

Electric Bell

2. As the striker moves towards the bell,
the contact is broken. Electricity stops flowing
through the coil which loses its magnetism.

3. The spring returns the striker to its original position
which makes a new contact and so electricity flows again.

Back to number 1 and the cycle repeats itself. The bell
will continue to ring as long as the switch is held closed.

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