Power Formula Calculation

The power P dissipated by a resistance R carrying a current I with a voltage drop V is:

P = V² / R = VI = I²R

Similarly, the power P dissipated by a conductance G carrying a current I with a voltage drop V is:

P = V²G = VI = I² / G

The power P transferred by a capacitance C holding a changing voltage V with charge Q is:

P = VI = CV(dv/dt) = Q(dv/dt) = Q(dq/dt) / C

The power P transferred by an inductance L carrying a changing current I with magnetic linkage Y is:

P = VI = LI(di/dt) = Y(di/dt) = Y(dy/dt) / L