Calculate voltage, current, resistance, and power. Enter any two values to find the others.
Ohm's Law states that the current flowing through a conductor connects voltage (V) and resistance (R).
Electrical Power (P) is the rate at which electrical energy is transferred.
P = V × I
Also: P = I²R or P = V²/R
Mathematically, dividing by zero is undefined. Physically, this represents a "short circuit" which allows infinite current flow, usually causing damage or fire.
Ohm's Law works perfectly for DC (Direct Current) circuits with resistive loads. For AC (Alternating Current), inductance and capacitance introduce "impedance" (Z) instead of just resistance, making the math more complex.
