Question

When a bulb of 60w and 220v is connected to another blub of 100w and 220v in series then which blub will grow more brightly?

Answer 1

60watt bulb will glow more brightly in series.

Answer 2

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The resistance of the bulb is given by R=V2/P.

So the resistance of 60 W bulb is more than the resistance of 100 W bulb.

When they are connected in series the current through both bulbs is same.

Hence 60 W bulb will be more brighter because P = I2R.