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• Formulas and calculation •

Electricity

Electrical voltage V, current I, resistance R, (impedance) Z, power 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 = intensity, V = voltage, electric potential difference, E = electro motive force (EMF = voltage) R = resistance.

Enter any TWO of the following values and click on the calculation button.
The missing values will be calculated. Enter only two values.
voltage E or V =   volts V
current I =   amperes, amps A
resistance R =   ohms Ω
power P =   watts W
 
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V comes from "voltage" and E from "electromotive force". E means also energy, so V is chosen.