In an electrical circuit three incandescent bulbs A, B and C of rating40 W, 60 W and 100 W respectively are connected in parallel to anelectric source. Which of the following is likely to happen regardingtheir 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
Question
In an electrical circuit three incandescent bulbs A, B and C of rating40 W, 60 W and 100 W respectively are connected in parallel to anelectric source. Which of the following is likely to happen regardingtheir 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
Solution
The brightness of a bulb is directly proportional to its power rating when connected to a constant voltage source. In this case, the bulbs are connected in parallel, which means they all receive the same voltage from the source. Therefore, the bulb with the highest power rating will be the brightest and the bulb with the lowest power rating will be the least bright.
So, the brightness of the bulbs will be in the order C > B > A. Therefore, the correct answer is (c) Brightness of bulb B will be more than that of A.
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