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Question : 99 of 100
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Magnetic effect of current.
- Electric bell works on the principle of electromagnetism.
- The circuit of an electric bell consists of a coil of wire wound on an iron piece.
- The coil act like an electromagnet.
- An iron strip with a hammer at one end is kept close to the electromagnet.
- There is a contact screw near the iron strip.
- When the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet.
- The hammer at the end of the strip strikes the gong of the bell to produce a sound.
- When the electromagnet pulls the iron strip, it also breaks the circuit, and the current through the coil stops flowing.
- The coil is no longer an electromagnet once the current through it stops flowing.
- The circuit completes when the iron strip comes back to its original position and touches the contact screw again.
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