Sizu Riatto
Maker Electronics Math · Chapters 1 & 4

Resistors in Series, in Parallel, and What You Can Buy

Two or more resistors, combined. Then the real value on the shelf, and what swapping to it costs.

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Enter at least one resistance, then press Calculate.
From the book — Chapters 1 & 4. Series: add them. Parallel: add the reciprocals and turn it back over. Two equal resistors in parallel are always half of one.

E12 is the twelve-value series a beginner's assortment is built from: 10 12 15 18 22 27 33 39 47 56 68 82, in every decade. Everything stays in your browser — no sign-up, nothing stored.