3rd of March 2017

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..

Dhruv Jain - CBSE - Class XII Science

Thursday, March 02, 2017 at 20:11:PM


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.

Friday, March 03, 2017 at 17:59:PM