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?

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KollegeApply · Accepted Answer

Brightness of bulb B will be more than that of A Explanation - Since all the three bulbs are connected in parallel so potential difference (V) across all the bulbs is same. Power dissipated is given by "P" = "V"^2/"R" Lower the resistance, higher the power dissipation. Hence higher the brightness. Out of all the three bulbs, 100 W bulb will have minimum resistance because rated voltage of all the bulbs will be same and its power dissipation is maximum. Thus, 100 W will have maximum brightness and 40 W bulb will have minimum brightness.

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