An ELectric bulb is rated 220V & 100W.WHEn it is operated on 110V, the power consumed will be?
The power consumption of an Electric bulb which is rated 220V & 100W is given by the following relation:
Where ‘P’ is the power rating, ‘V’ is the voltage at which the bulb functions and ‘R’ is the resistance provided
by that bulb to the flow of current across the circuit.
Therefore, the resistance ‘R’ due to the bulb is 484 Ohm
Now when the same bulb is used across the voltage of 110 V, the power consumed by this bulb is given by
Therefore, the Power consumed by this bulb across 110 V is 25 Watts.