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Chapter 14 Electric Current and Its Effects Solutions

Question - 11 : -
An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

Answer - 11 : -

No, I will not agree. Electric fuse is made from some special material which blows off when the current exceeds the safe limit, while an ordinary wire may not perform this function and will cause damages to electrical circuits and appliances and also can cause fires. Hence I will insist to use proper fuse wire carrying ISI mark.

Question - 12 : -
Zubeda made an electric circuit using a cell holder shown in the following Fig., a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.

Answer - 12 : -

These may be the reasons by which bulb will not glow.
(i) The cell may be connected in improper way. Check out that the positive terminal of one cell is connected to the negative terminal of the other or not.
(ii) The junctions of the wire may be loose. Check them again.
(iii) Check the condition of the bulb. Replace it. if it is fused.

Question - 13 : -
In the circuit shown in the following Fig.:
(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Answer - 13 : -

(i) No. None of the bulbs will glow unless the switch is in the ‘ON’ position.
(ii) All the three bulbs will glow at the same time as far as the capacity of the battery is concerned.

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