Calcolatore Resistenza LED
Calcola la resistenza necessaria per limitare la corrente in un circuito LED.
V
A
Resistenza
24.00 Ω
Potenza6.000 W
Resistance vs Voltage
Formula
How Ohm's Law Works
Ohm's Law links voltage, current, and resistance.
Formula
V = I x R
Where:
Rearranging gives R = V / I and I = V / R. Power is P = V x I.
Esempio Risolto
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
Domande Frequenti
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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