current charge time
current = charge/time
current pd resistance
current = pd/ resistance
energy pd charge
energy = pd x charge
r total r2 r1
r total = r1 + r2
power resistance current
power = current x current x resistance
power voltage current
power = voltage x current
energy power time
energy = power / time
power current pd
power = current x pd
power energy trans time
power = energy trans/ time
power work done time
power = work done/ time