Ohm's Law Calculator - Voltage, Current, Resistance & Power (2026)
Calculate Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm's Law and Joule's Law. Enter any two values to solve for the other two.
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⚙️ Configuration & Inputs
V
A
Ω
W
📊 Results & Analysis
Calculated Electrical Power
30.00 Watts
Resistance: 4.80 Ω (Ohms)
| Voltage (V) | 12.00 V |
| Current (I) | 2.50 A |
| Resistance (R = V / I) | 4.80 Ω |
| Power (P = V × I) | 30.00 W |
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The Ohm's Law Equations
V = I × R | P = V × I = I²R = V² / R
Formulated by German physicist Georg Simon Ohm in 1827, Ohm's law defines the relationship between electrical potential (Voltage in Volts), charge flow rate (Current in Amperes), and conductor opposition (Resistance in Ohms).
Frequently Asked Questions
If resistance is zero in an ideal circuit with voltage, current approaches infinity, creating a short circuit that trips breakers or causes fire.