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Question

In a circuit with one bulb, another bulb is added in series. What happens to the bulbs when current is passed?


A

They do not glow.

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B

They glow less brightly.

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C

They glow more brightly.

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D

They get fused.

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Solution

The correct option is B

They glow less brightly.


A circuit has one bulb, if another is connected in series, the voltage(potential difference) will be divided across both the bulb,

i.e., if the voltage across the first bulb was V then the new voltage across the 1st and the 2nd bulb will be V1 and V2, such that V= V1 + V2.

Because of the potential drop/ divide, the brightness of the two bulbs will be less than the brightness with which the single bulb was glowing earlier.


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