3.
The wires used for making electric circuits do not normally become hot. On the other hand, the elements of some electric appliances become so hot that they this change is even visible. Why is it so?This is due to the heating effect of current. The heat generated is due to the resistance of the wire. Please refer to the given link to know more:
https://www.meritnation.com/ask-answer/question/what-is-the-heating-effect-of-current-and-where-is-it-u/electricity/5651672
https://www.meritnation.com/ask-answer/question/what-is-the-heating-effect-of-current-and-where-is-it-u/electricity/5651672