Free Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's law: V = I * R.
A
Ω
Voltage
20.0000 V
Power40.0000 W
Voltage vs Current
Ohm's Law
Ohm's law is the foundational relationship in circuit analysis, connecting voltage, current, and resistance.
Formula
V = I * R
where V is voltage in volts, I is current in amperes, and R is resistance in ohms. Power dissipated is P = I² * R.
Example Calculation
2 amperes flowing through a 10 ohm resistor.
- 01V = I * R
- 02V = 2 * 10
- 03V = 20 V
- 04P = I² * R = 4 * 10 = 40 W
Frequently Asked Questions
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