(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 precautions which should be observed in the use of electricity.

(d) What will you do if you see a person coming in contant with a live wire ?

(e) Explain why, electric switches should not be operated with wet hands.

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Solution

a)

b) (i) Touching a live wire can give a hazardous shock.
(ii) Short-circuiting due to damaged wiring can cause fire in the building.

c)(i)Use of good quality wires
(ii) Use of fuse and proper earthing.
(iii)Use of appliances in dry condition only.

d) Switch off the main supply quickly.

e)Water is a good conductor of electricity so the person may get electric shock.

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Question 5

Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?

(a) We should never touch a lighted electric bulb connected to the mains

(b) We should never experiment with the electric supply from the mains or a generator or an inverter

(d) We should never turn the switch in ON position

Write true or false for each statement:

(a) A fuse wire has a high melting point.

(b) Flow of protons constitutes electric current.

(d) S.I. unit and commercial unit of electrical energy are same.

(e) Overloading of electric current in circuits can lead to short circuiting.

(f) Our body can pass electricity through it.

(g) The metallic cases of all appliances are insulators of electricity.

(h) The earth wire protects us from an electric shock.

(i) A switch should not be touched with wet hands.

(j) All electrical appliances in a household circuit work at the same voltage.

(k) In a cable,the green wire is the live wire.

(l) A fuse is connected to the live wire.

(m) A switch is connected to the neutral wire.

Q. You want to make an electric circuit in which electric current makes a bulb glow. Which of the following is not absolutely necessary in the circuit?

(a) connecting wires
(b) switch
(c) electric cell
(d) electric bulb

(a) Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? Why?
(b) Chrismas tree lamps are usually wired in series. What happens if one lamp breaks?
(c) An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?
(d) Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an A on your diagram to show where an ammeter should be placed to measure the current.

A power circuit uses a cable having three different wires.

(a) Name the three wires of the cable.

(b) Between which of the two wires should the heating element of an electric geyser be connected?

(d) To which wire should the switch and fuse be connected?

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