Q27 of 35 Page 93

Why is parallel arrangement used in domestic wiring?

If different appliances in a domestic are connected in series then if one of the appliance is switched off or stops working then the other appliances will also stop. Moreover, if they are connected in series, then then there will be different voltage for different appliances and there will be loss of voltage due to add on effects of resistances. Each appliance is connected in parallel to each other so that each appliance has an equal potential difference. That’s why series arrangement is not used in domestic circuits and parallel arrangement is used in domestic wiring.


More from this chapter

All 35 →
25

What is the commercial unit of electrical energy? Represent it in terms of joules.

 26

A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 Ω when connected to a 10 V battery. Calculate the resistance of the electric lamp. Now if a resistance of 10 Ω is connected in parallel with this series combination, what change (if any) in current flowing through 5 Ω conductor and potential difference across the lamp will take place? Give reason.

 28

B1, B2 and B3 are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.


(i) What happens to the glow of the other two bulbs when the


bulb B1 gets fused?


(ii) What happens to the reading of A1, A2, A3 and A when the


bulb B2 gets fused?


(iii) How much power is dissipated in the circuit when all the


three bulbs glow together?

 29

Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.

(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.


(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.