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  • In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? (a) Brightness of all the bul

In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? 

(a) Brightness of all the bulbs will be the same 

(b) Brightness of bulb A will be the maximum 

(c) Brightness of bulb B will be more than that of A 

(d) Brightness of bulb C will be less than that of B

Answers (1)

Given that bulb A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source.

In parallel, the voltage applied across all the bulbs would be the same.

Power of a bulb is directly proportional to the brightness produced by it.

Hence the brightness of C > B > A.

Therefore, option (c) is correct.

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