Question
In an electric bell, when the electromagnet pulls the iron strip, it also breaks the circuit. The current through the coil stops flowing. In this case, will the coil remain an electromagnet? How does an electric bell ring then? [3 MARKS]
Answer:
:
Working of electric bell: 3 Marks
The coil is no longer an electromagnet. It no longer attracts the iron strip.
The iron strip comes back to its original position and touches the contact screw again. This completes the circuit. The current flows in the coil and the hammer strikes the gong again. This process is repeated in quick succession.
The hammer strikes the gong every time the circuit is complete.
This is how an electric bell rings. The continuous breaking and completing of the circuit enable the gong to strike the hammer continuously.
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:
Working of electric bell: 3 Marks
The coil is no longer an electromagnet. It no longer attracts the iron strip.
The iron strip comes back to its original position and touches the contact screw again. This completes the circuit. The current flows in the coil and the hammer strikes the gong again. This process is repeated in quick succession.
The hammer strikes the gong every time the circuit is complete.
This is how an electric bell rings. The continuous breaking and completing of the circuit enable the gong to strike the hammer continuously.
Was this answer helpful ?
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