LibraTool logoLibraTool
⚡
📉

Calculate Voltage Across a Component

Find the voltage drop across a resistor from current and resistance.

Sisselogimist ei nõuta
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.

Voltage Drop tips

📉

Enter current and resistance to get the voltage dropped across that component (V = I × R).

💡

In a series circuit the voltage drops add up to the supply voltage — handy for voltage dividers.

🎯

Long thin wires have resistance too; significant drop there means you need a thicker gauge.

Kuidas see töötab

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

Miks kasutada meie oma?

✓Täiesti tasuta — varjatud kulusid pole kunagi
✓Kontot, e-posti ega sisselogimist ei nõuta
✓Failid ei lahku kunagi sinu seadmest
✓Faili suuruse piiranguid pole üldse
✓Ühegi väljundi peal pole vesimärke

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

🎓

Solve Ohm's Law Homework

Check circuit problems by entering any two known v

🔋

Estimate Current Draw from a Battery

Find the current a load pulls so you can estimate

Korduma kippuvad küsimused

Back to Ohm's Law Calculator