Name: Magnetic Effect of Electric Current
Uploaded: 2019-07-19
Duration: 7 min 45 s
Description: We know that electricity is used to generate heat in geysers and irons. Today, let’s experiment to see how electricity can be used to create a small magnet!

Question

The diagram shows the circuit diagram and simple construction of an electric bell.

Put the following sentences in the correct order to explain how the bell operates.

A current flows through the electromagnet.
At the same time, the circuit is broken at point A.
Someone presses the bell push.
The circuit is completed again at A.
The electromagnet attracts the iron armature.
The hammer strikes the gong.
The springy metal pulls the hammer back.

Accepted Answer

An electric bell is a device that works using direct current from a battery. It works on the magnetic effect of electricity. The working of an electric bell can be as described below.

When someone presses on the bell push, the circuit is completed. Current flows from the battery round through the electromagnet coil and the springy strip, and back to the battery via the contact point A.

The coil is now magnetised and attracts the springy strip. Two things now happen: the hammer strikes the gong and the circuit breaks at point A.

The current Stops, the coil is no longer magnetised, and the strip springs back to its original position.

Now the circuit is complete again and a current flows once more. The coil is magnetised and attracts the iron again, the hammer strikes the gong, and so on.

This process repeats itself for as long as the bell push is depressed.

Important Questions on Electromagnetic Forces

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