Calculator · Electrical Engineering
Series & Parallel Resistor Calculator
Combine resistors in series (resistances add) or in parallel (conductances add) and see how much of the voltage or current each one takes.
Inputs
Edit the list, then leave the field to recalculate.
Results
Equivalent resistance R_eq
650 Ω
Equivalent conductance G_eq
1.538 mS
| R1 = 100 Ω | 15.38 % of the voltage · G = 10 mS |
|---|---|
| R2 = 220 Ω | 33.85 % of the voltage · G = 4.545 mS |
| R3 = 330 Ω | 50.77 % of the voltage · G = 3.03 mS |
Explore in the Lab
Open this resistor network in the Electrical Networks Lab
The Lab drives the group with a 10 V test source; R_eq = 10 V / source current.
Technical reference
Series: R_eq = R1 + R2 + … + Rn
Parallel: 1/R_eq = 1/R1 + … + 1/Rn, G_eq = Σ G_k
Series share: R_k/R_eq; parallel share: G_k/G_eq
- R_k
- resistance of resistor k (> 0)[Ω]
- G_k
- conductance 1/R_k[S]
In series every resistor carries the same current; in parallel every resistor sees the same voltage.