Color bands · U = I·R

🎛️ Resistor & Ohm's Law

Click the color bands on a life-like resistor to read its value — or type a value to get the nearest standard E24/E96 resistor. Plus an Ohm's law pad: enter any two of U, I, R, P and the rest appear.

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Value → nearest standard resistor

Wanted value (Ω) — e.g. 4.7k, 220, 1M

Ohm's law — enter any TWO

U — Volt (V)

I — Ampe (A)

R — Ohm (Ω)

P — Watt (W)

IEC 60062 colors: black 0 … white 9; gold ×0.1/±5%, silver ×0.01/±10%. 5–6 band resistors carry 3 significant digits (precision); the 6th band is the temperature coefficient (ppm/K). Ohm's law: U = I·R, P = U·I.