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CBSE - XII Science - Physics

I have a doubt so as to where to use the formula of power....where to use P=I^2/R , P=VI , P=V^2/R....I DID MANY QUESTIONS BUT USED THE FORMULA ACCORDING TO THE ANSWER GIVEN...PLZ HELP..

Asked by Dhruv 2nd March 2017, 8:11 PM
Answered by Expert


Hi Dhruv,

In the formula for power the three variants have quantities as current and resistance, voltage and current and voltage and resistance. So, based on the data given you can decide which formula to use. If current and voltage are given then use P = VI. If current and resistance are given then use P = I2R.

Answered by Expert 3rd March 2017, 5:59 PM

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