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Answer:

DC Power or instantaneous AC power is defined as Voltage*Current= V*I

But as per Ohms law current  I=  V/R .where R is the resistance of the circuit.

Hence Power  P=V*I= V*V/R= V^2/R  or interms of current  P=I^2*R

Answer
W(work)= F*x = qE*x =qV/x*x So W = qV We know P= dW/dt P=V*dq/dt =V*I Since as per Ohm's Law I =V/R So P = V*V/R
Answer

Power = Voltage*Curent

But, Voltage = Current*Resistance    Or, Current = Voltage/Resistance

So, Power can be written as Voltage^Voltage/Resistance = (Voltage)^2/Resistance [P = V^2/R ]

Again, Power can be given as Current*Resistance*Current = (Current)^2*Resistance [ P = I^2.R ]

 

Answer
Power = V *I I = V/R Ohms law Power=V *V/R Power= V square /R

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