•Now what can you comment on “when we touch appliance's outercase we get shock what do you think why it happens” ? what precautions are taken for that?
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I can't understand your question
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Answer:
Precautions taken: Proper Earthing of switches and devices.
Explanation:
sometimes you get a shock when you touch appliances. it is due to short circuit or overflow of charge or current in the circuit. It can be dealt by connecting the device with earth so the extra charge is taken to the earth which neutralises it and your life is saved.
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