Question

(a) Draw a labelled diagram to show the domestic electric wiring from an electric pole to a room. Give the wiring for a bulb and a three-pin socket only.
(b) State two hazards associated with the use of electricity.
(c) State the important precaution which should be observed in the use of electricity.
(d) What will you do if you see a person coming in contact with a live wire?
(e) Explain why, electric switches should not be operated with wet hands.

Answer 1

(a)

b) Hazards associated with the use of electricity:
1. Short circuit due to damaged wiring or overloading of the circuit can cause electrical fire in a building.
2. There is a risk of shock associated with the use of electricity. If a person touches a live electric wire, he gets a severe electric shock. In some cases, shocks can be fatal.

(c) Precautions in the use of electricity:
1. Electrical appliances should be given earth connections to avoid the risk of electric shock.
2. Household wiring should be done by using good quality wires with proper thickness and insulation.
3. Switches, fuses and circuit breakers should be connected in series with the live wire.
4. Switches in 'on' position should not be touched with wet hands.

(d) If a person comes in contact with a live wire, the main switch should be turned off at once to cut off the electricity supply. Moreover, the person can also be provided with an insulated support of wood, plastic or rubber.

(e) We should not operate electric switches with wet hands because water conducts electricity. Thus, touching the switches with wet hands can lead to electric shocks.