Ab electric bulb is rated 220v and 100W. When it is operated on 110v, the power consumed will be :
I knew the answer I want to know, why can't we calculate current. Why we have calculated resistance.
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Ab electric bulb is rated 220v and 100W. When it is operated on 110v, the power consumed will be :
I knew the answer I want to know, why can't we calculate current. Why we have calculated resistance.
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Answer:
R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V2/R = 1102/484 = 25 W. So, 25 W power is consumed when it is operated on 110 V.
Verified answer
Answer:
25W
Explanation:
Ayushi, In this question we have calculated resistance because, for a GIVEN CIRCUIT, resistance does not change it is constant.
But for electric current, is dependent on the POTENTIAL DIFFERENCE/VOLTAGE provided to the circuit and we know this by OHM'S LAW.
solving this question we get,
P= V²/R
R=V²/P
R= 220*220/100
R= 484 ohm
now, again using
P= V²/R
P=110*110/484
P=25W
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