Which of the following precautions need not be taken while using electric appliances?

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We should never touch a lighted electric bulb connected to the mains

We should never do experiment with the electric supply from the mains or a generator or an inverter

We should never use just any wire or strip of metal in place of a fuse

We should never turn the switch in ON position

answer is D.

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Detailed Solution

We should never turn the switch in the ON position when using electric appliances.
A switch is an electric device that, when kept in the ON position, closes the circuit and thus, current flows through the circuit. To use any electrical appliance, we will have to keep the switch in the ON position. Otherwise, no current will flow through it, and it won't work. So turning off or on a switch doesn't have to be any precaution that is required to be taken while electronics are working experiment.

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