Question

Three bulbs of 100W,each are connected in series in a circuit. In another circuit,another set of 3 bulb of sane wattage are connected in a parallel to the same source. Will the bulb in the circuit glow with the same brightness? Justify.

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Answer 1

1.No.

Reasons: Let R be the resistance of each bulb, then total resistance in series = 3R

In series, current in each bulb is same.

So current drawn by each bulb connected in series is one-third as compared to the current in each bulb in parallel arrangement, so the bulbs connected in parallel combination glow more brightly..

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Answer 2

Answer:

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

Ans. Voltage gets divided in series combination. So bulbs in series combination will glow with less brightness. Voltage does not get divided in parallel combination, so bulbs in parallel combination will glow with more brightness.

(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.

Ans. In case of series combination, fault in even a single component will break the circuit.

So, when one of the bulbs gets fused: another bulb would continue to glow.