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An electric bulb is rated 220v …

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An electric bulb is rated 220v and 100w.when it is operated on 110v.the power consumed will be?

Posted by Ahmed Mihad 5 years ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years ago

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.

Mohamed Inaam 5 years ago

25w

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