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Ohm's law

R Ω
U V
I A
P W

Lock

Resistance Voltage Current Power

Detailed locks

What to keep constant while you adjust other values

This is a simple Ohm's law/Joule's first law calculator.

You can change any value. After changing a number, press Enter to recalculate. The other values will be updated.

The values can be locked, so that they do not change when you adjust other values.

Click the menu button to reset to default settings, save/load your current values, or show detailed locks.

How it works

Video tutorials