Circuit Calculator
Series Resistors
Parallel Resistors
Formula
Series: R_total = R1 + R2 + R3. Parallel: 1/R_total = 1/R1 + 1/R2 + 1/R3.
Frequently Asked Questions
How do series and parallel resistors differ?
In series, resistances add directly: R_total = R1 + R2 + ... In parallel, reciprocals add: 1/R_total = 1/R1 + 1/R2 + ... Parallel resistance is always less than the smallest individual resistor.
What if I have more than 3 resistors?
For more resistors, apply the same formulas with additional terms. Series: keep adding. Parallel: keep adding reciprocals.