R P Goyal and S P Tripathi Solutions for Chapter: Electrical Power and Household Circuits, Exercise 3: EXERCISE-9(C)

Draw a Labelled Diagram of a Three Pin Socket.

The earthing of an electric appliance is useful only if the fuse is in the live wire. Explain the reason. Name the part of the appliance which is earthed.

For earthing an electrical appliance, one has to remove the paint from the metal body of the appliance where the electrical contact is made. Explain the reason.

What is the colour code for the insulation on the live wire, neutral wire and earth wire?

A power circuit uses a cable having three different wires.
(a) Name the three wires of the cable.
(b) To which of the two wires should the heating element of an electric geyser be connected?
(c) To which wire should the metal case of the geyser be connected?
(d) To which wire should the switch and fuse be connected?

State two circumstances when one may get an electric shock from an electrical gadget. What preventive measure must be provided with the gadget to avoid it?

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

Give two characteristic of a high tension wire.