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Answers
Explanation:
Q. 1 According to the Joule's heating effect of current, when current I flows through a resistor of electric resistance R, heat is produced. The amount of heat produced is directly proportional to the:
(i) the square of current flowing in a circuit
(ii) resistance in the circuit and
(iii) time in which the current flows in the circuit i.e H=IRt
Q.2 1) Electric Iron
2) Electric heater
3) Electric geyser
4) Induction Cooker
5) Microwave Oven
6) Hair blower
Q. 3 1) When an electric current flows through the conductor, a part of it is converted into heat energy. This is a waste of energy.
2) The heat produced can damage the insulation and other electrical components, or even cause a fire
3) Reduces the life of several components in the circuit
Q. 4 FUSE,, The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong.
Q. 5 Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.