Answer:
(a)
After long use, the wires get heated up due to heating effect of current. This
increases the resistance of the device resulting in consuming less power.
(1)
(b) Manish is fully justified with his act because the device requires
higher potential, thus its efficiently decreases. (1)
(c) Manish is a highly concerned, sincere, alert and sensible
user of electricity. His friends need to look into the cause and reason of such
practices instead of making fun of him unnecessarily. (1)
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