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Electric Power

In an electri...

Question

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

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B

Brightness of bulb A will be the maximum

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C

Brightness of bulb B will be more than that of A

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D

Brightness of bulb C will be less than that of B

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Solution

The correct option is C Brightness of bulb B will be more than that of A
Hint : Brightness is directly proportional to the power consumed.

Step 1 : Compare the power consumed by the bulbs
Given : Three bulbs connected in parallel to an electric source consume power $40 W, 60 W, 100 W$ respectively.
As we know, brightness of a bulb is directly proportional to the power consumed.
$∴$ Brightness of bulb $A < B < C$

Option C is correct.

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