(a) Name the three connecting wires used in a household circuit.

(b) Which of the two wires mentioned in part (a) are at the same potential?

(c) In which of the wire stated in part (a) the switch is connected?

What is the pole fuse? Write down it's current rating.

State the function of each of the following in a house circuiting —

(a) kWh meter, (b) main fuse, and (c) main switch

Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow.

(i) Explain the difference in the two sets,

(ii) Which set of arrangement is preferred in housing circuit and why?