three bulbs of 40 W, 60 W and 100 W are connected in series to a current source of 200V. Which of the following statements is true?

40W bulb glows brightest

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60W bulb glows brightest

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100W bulb glows brightest

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all bulbs glow with same brightness

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Solution

The correct option is B 40W bulb glows brightest

We know,

In series circuit, current is same in every component.

And more the wattage more less is the resistance offered.

And in this case,

Brightest bulb will have highest resistance among them, as current is same in all the three .

Hence,Option $A$ is the correct answer

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