How to know which formula will be used for calculating power and heat numerical? As there are 3 formulas.. plz guide Share with your friends Share 0 Sagar Kumar answered this Dear Student,Formulas for calculating the power are:-P =work donetime=VI=I2R=V2RWe can use any of the formula to calculate the power, as all the three are interconnected.P=VIwe can write V = IR from ohm's lawThen, P=I2RNow replacing I as VRThen, P=V2RIf only potential difference and Current is given , then we can use P =VIIf only resistance and Current is given , then we can use P =I2RIf only potential difference and Resistance is given , then we can use P =V2RRegards 0 View Full Answer Ganga answered this P =V I P = V2/R P = I2R P t = W H = I2 R T 1
