What is the formula for resistors in series?

Resistances in series simply add — Rt = R1 + R2 + ... + Rn. The total is always larger than any single resistor.

How is series different from parallel?

In series the resistances add directly, increasing the total. In parallel the reciprocals add, so the total is smaller than the smallest resistor.

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Total resistance of resistors wired in series.

When resistors are connected in series, the total (equivalent) resistance is simply the sum of the individual values:

R_t = R₁ + R₂ + … + R_n

The total is always larger than any single resistor. Enter your values in ohms and the sum updates instantly — all in your browser.