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.
• B. They glow less brightly.
• C. They glow more brightly.
• D. They get fused.

Answer 1

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.