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CBSE - X - Physics - Electricity

an electric heater draws a current of 40 ampere when 60 volt potential diffrence is applied.what will be the current when p.d is increased to 120 volts?can i solve this question by formula P=VI?

Asked by vinayak mathur 31st July 2012, 7:48 PM
Answered by Expert


As the other things remain constant, so as the pd is doubled,current will also get doubled according to Ohm's law. If pd increase then the power will obviously increase we can not apply p=vi as on increasing pd other two of the variables will be changing .
Answered by Expert 1st August 2012, 11:26 AM

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