Question

Earthing wire in domestic electric circuits is a safety measure. Justify this statement explaining its role in case of accidental leakage of electric appliances.

Write Joule's law of heating. How is this effect useful in electric circuits where fuse is used as a safety device ?

Explain in brief the function of an electric fuse in a domestic circuit. An electric heater of current rating 3 kW; 220 V is to be operated in an electric circuit of rating 5 A. What is likely to happen when the heater is switched 'ON' ? Justify your answer with necessary calculation.

In a domestic circuit five LED bulbs are arranged as shown. The source voltage is 220 V and the power rating of each bulb is marked in the circuit diagram. Based on the following circuit diagram, answer the following questions :