Enter any two of voltage, current, resistance or power and get the other two. V = I × R, P = V × I.
Enter any two values, then the other two are filled in automatically.
It states that voltage equals current times resistance: V = I × R. Combined with power P = V × I, any two of the four quantities determine the other two.
Any two — voltage and current, current and resistance, power and voltage, and so on. The calculator detects the pair and derives the rest.
Volts (V), amperes (A), ohms (Ω) and watts (W) — the standard SI electrical units.