Ohm's Law Calculator (Voltage, Current, Resistance & Power)
Solves Ohm's Law and Joule's Law relationships for direct current (DC) and single-phase AC circuits with unity power factor. Provide any two values to solve for the other two.
PARAMETERS(3)
LOAD VERIFIED SCENARIO
ACTIVE COMPUTATION
Resulting Voltage (V)
20Volts (V)
Power: 40 W
Current (I)
2A
Resistance (R)
10Ω
Power Dissipated (P)
40Watts
STEP-BY-STEP MATHEMATICAL DERIVATION
1Ohm's Law: V = I × R = 2 A × 10 Ω = 20 V
2Joule's Power: P = V × I = 20 V × 2 A = 40 W
MATHEMATICAL FORMULA & GOVERNING PRINCIPLES
V = I * R, P = V * I = I² * R = V² / R
Ohm's Law dictates that electrical potential (V) equals current (I) multiplied by electrical resistance (R). Power (P) in Watts is the rate of energy dissipation.
FREQUENTLY ASKED QUESTIONS (FAQ)
Does Ohm's Law apply to AC circuits with capacitors and inductors?
In alternating current (AC) reactive circuits, resistance R is replaced by impedance Z, accounting for capacitive and inductive reactance and phase angle.
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