Fundamentals
Ohm's Law Calculator
Plug in any two of voltage, current, resistance, and power — get the other two. Includes formulas so you can sanity-check your circuit.
Fill in any two values, leave the others blank.
V
4.4 V
I
0.02 A
R
220 Ω
P
0.088 W
V = I × RP = V × I = I² × R = V² / R
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