Physics
Resistors in series
Series resistances add directly because the same current flows through each one.
The Formula
R = R1 + R2 + R3
Series resistances add directly because the same current flows through each one.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| R | Total resistance | ohms | The equivalent resistance of the chain, in ohms. |
| R1, R2, R3 | Individual resistances | ohms | Each resistor in the series chain, in ohms. |
What Each Symbol Means
Rohms
Total resistance
The equivalent resistance of the chain, in ohms.
R1, R2, R3ohms
Individual resistances
Each resistor in the series chain, in ohms.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate total resistance page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Total Resistance, filed under Science. Every number the guide produces comes from substituting into this one line.