Calculateur de la Loi d'Ohm Gratuit
Calculez la tension, le courant ou la résistance avec la loi d'Ohm.
V
A
Résistance
24.00 Ω
Puissance6.000 W
Resistance vs Voltage
Formule
## How Ohm's Law Works Ohm's Law links voltage, current, and resistance. ### Formula **V = I x R** Where: - **V** = Voltage in volts - **I** = Current in amperes - **R** = Resistance in ohms Rearranging gives **R = V / I** and **I = V / R**. Power is **P = V x I**.
Exemple Résolu
A 12 V battery drives 0.5 A through a resistor.
- 01Resistance R = V / I = 12 / 0.5 = 24 ohms
- 02Power P = V x I = 12 x 0.5 = 6 W
Questions Fréquentes
What is Ohm's Law?
Ohm's Law states that current is proportional to voltage and inversely proportional to resistance: V = I x R.
When does Ohm's Law not apply?
It does not apply to nonlinear devices like diodes and transistors where resistance changes with voltage or current.
How do I find current if I know voltage and resistance?
Rearrange to I = V / R. For example, 12 V across 24 ohms gives 0.5 A.
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