an electric bulb is rated 220v and 100w. when it is operated on 110v, then the power consumed is??
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Answered by
18
Answer
P = V2/R
If V = 220 V we have
100 W = 2202/R
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.
Hope this helps u and good luck with the answer
P = V2/R
If V = 220 V we have
100 W = 2202/R
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.
Hope this helps u and good luck with the answer
Answered by
5
R=220×220/100=484ohm
P=110×110/484=12100/484W
P=110×110/484=12100/484W
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