• Calculation: electrical voltage, current, resistance, and power •
The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often assumed as resistance R.
Ohm's law: E = R × I and power law: P = E × I.
P = power, I = intensity, E = electro motive force (EMF = voltage), V = voltage, potential difference, R = resistance.
V or E from "voltage" or "electro motive force"