Electrical voltage V, amperage I, resistivity R, impedance Z, wattage P
The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often assumed as resistance R.
Ohm's law equation (formula): V = I × R and the power law equation (formula): P = I × V.
P = power, I or J = Latin: influare, international ampere, or intensity and R = resistance.
V = voltage, electric potential difference or E = electro motive force (EMF = voltage).
V comes from "voltage" and E from "electromotive force". E means also energy, so V is chosen.
