Equations
Two resistors in parallel
Electricity and magnetism · id parallel_resistors
\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
R | equivalent resistance | ohm | Total resistance | 0.001 to 1e+09 |
R1 | resistance 1 | ohm | First resistor | 0.001 to 1e+09 |
R2 | resistance 2 | ohm | Second resistor | 0.001 to 1e+09 |
Assumptions
- Ideal wires
Valid when
- No extra conditions.
Look-alikes
Two resistors in series has exactly the same variables, so only the question's words tell them apart. To get this one, use one of: parallel. A question that says neither gets an answer flagged as ambiguous.
Found by
Questions with these words retrieve this equation: parallel, resistors, equivalent resistance, circuit, total resistance.
Source
OpenStax University Physics Volume 2, Chapter 10 (reference; entry written by the project). License: MIT. Entry confidence: 0.99.