Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's law: V = I * R.
Tensão
20.0000 V
Voltage vs Current
Formula
## 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.
Exemplo Resolvido
2 amperes flowing through a 10 ohm resistor.
- 01V = I * R
- 02V = 2 * 10
- 03V = 20 V
- 04P = I² * R = 4 * 10 = 40 W
Perguntas Frequentes
Does Ohm's law apply to all materials?
No. Ohm's law applies to ohmic materials where resistance is constant. Non-ohmic devices like diodes and transistors have nonlinear V-I relationships.
What is resistance?
Resistance is the opposition to current flow, measured in ohms. It depends on the material, length, cross-section, and temperature of the conductor.
Can Ohm's law be used for AC circuits?
For AC, impedance (Z) replaces resistance: V = I * Z. Impedance includes resistance plus reactance from capacitors and inductors.
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