in question number 3 here.. why can't we use the equation P=VI and find the current first?... please help fast
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We cannot use P=VI because I is not a constant factor. R is constant. I changes itself according to V to make R remain constant. The resistance of a conductor remains constant.
Therefore,
100=220×220/R
R=484
P= 110×110/484
P= 25W
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