LibraTool logoLibraTool
⚡
🎓

Solve Ohm's Law Homework

Check circuit problems by entering any two known values.

Non é necesario iniciar sesión
V
A
Ω
W
Enter any two values and the other two are solved automatically

💡 Ohm's law: V = I × R. Power adds P = V × I. Knowing any two lets you derive the rest — handy for sizing resistors, checking LED current, or working out heat dissipation.

Students tips

🎓

The core relationships are V = I × R and P = V × I — every other formula is derived from these two.

💡

Enter the two values your problem gives you and verify your hand calculation against the result.

🎯

Watch your units: volts, amps (not milliamps), and ohms. Convert mA to A by dividing by 1000.

Como funciona

1
Entra
Enter your data into the tool above. Everything stays local to your browser.
2
Proceso
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Descargar
Get your result instantly. Nothing is stored after you leave the page — complete privacy.

Por que usar o noso?

✓Completamente gratuíto, sen custos ocultos, nunca
✓Non se precisa ningunha conta, correo electrónico ou inicio de sesión
✓Os ficheiros nunca saen do teu dispositivo
✓Non hai límites de tamaño de ficheiro
✓Non hai marcas de auga en ningunha saída

Also check out…

💡

Size a Current-Limiting Resistor for an LED

Work out the resistor value an LED needs from supp

🔥

Calculate Power Dissipation (Watts)

Find how many watts a component dissipates so you

🔋

Estimate Current Draw from a Battery

Find the current a load pulls so you can estimate

📉

Calculate Voltage Across a Component

Find the voltage drop across a resistor from curre

Preguntas frecuentes

Back to Ohm's Law Calculator