Please answer quickly. Having an exam.
30 points |
_______
An electric bulb is rated 220V and 100W. When it is operated on 110V, what will be the power consumed?
I am attaching an answer to this question as well. In the given answer the equation P= (V^2)/R is used. Now my real question is, can't we use P=VI and solve this question? I tried it and I got a different answer. What does that indicate?
The question doesn't tell anything about the current through the circuit changing.
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see the attachment may it helps
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Answer:
An electric bulb is rated 220V and 100W. When it is operated on 110V, what will be the power consumed..
ANSWER..
25 Watts
EXPLANATION...
An ELectric bulb is rated 220V & 100W. WHEn it is operated on 110V,the power consumed will be? by that bulb to the flow of current across the circuit. -Therefore, the Power consumed by this bulb across 110 V is 25 Watts.
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