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In electric bell, when the switch is pressed, the hammer strikes a metal plate continuously. Here, the electric energy is converted into mechanical  energy.
Due to the striking of hammer on metal plate, sound is produced. Here mechanical energy is converted into sound energy.
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In an electric bell a hammer continuously strikes a metal surface.Here the electrical energy is converted into mechanical energy.
When the hammer strikes the metal surface sound is also produced. Thus this is how the electric school bell works

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