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Electric Bell

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Question

Electric doorbell

A

Always consume power

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B

Consume power only when switch is pressed

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C

Do not consume power practically and needs only starting power

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D

Can't say

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Solution

The correct option is B Consume power only when switch is pressed
When the switch is pressed, the circuit completes and ringing begins. Hence, electrical energy is converted to sound energy. As the switch is released, no current flows, and no energy is consumed.

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