Why are switches/keys used in a circuit?

To save power

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To protect the system

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To control a device

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All of above

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Solution

The correct option is D All of above
Switches allow the user of gadget to turn off the gadget when not required. Hence, A and C follows.
Using a device only when required reduced the wear and tear and protects the system. Hence, B is correct. hence A , b and C all are correct that's why option D is answer.

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