2. Which of the following appliances will not work on DC supply? (b) Electric Iron (a) Call bell (c) Buzzer (d) Electic Kettle
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electric kettle...... I think
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Call Bell will not work on DC Supply.
A call Bell works on the principal based on electromagnetism. When a AC current source is connected to the call Bell, the call Bell can alternatively change the direction of the bushes and it will sound because of the changes in direction of the sound. But DC has only one direction. Hence it'll not work.
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