Sat January 29, 2011 By: Dipti Priya

Power = current square into resistance hence p is directly proportional to r also Power =voltage square upon resistance so p is inversely proportional to r but how power can be both directly and inversely proportional to resistance?

Expert Reply
Sat January 29, 2011
Dear student,
we dont apply the two formulas simultaneously ...when current is constant we apply p=i^2r ..hence directly proportional..and when potential constant..we apply p=v^2/ inverse relation with r.
hope this helps.
Thanking you
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