100 Ω and 200 Ω Resistors in Parallel
A 100 Ω and 200 Ω resistor in parallel produce an equivalent resistance of approximately 66.7 Ω.
How to use this tool
- Enter r1, r2, r3 (optional) and r4 (optional) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your equivalent resistance and the full breakdown beneath it.
The parallel combination of 100 Ω and 200 Ω is a common exercise in circuit analysis that yields about 66.7 Ω.
Frequently asked questions
- Why is the result always lower than the smallest resistor?
- Adding parallel paths gives current more routes to flow, reducing total opposition. Each additional resistor adds conductance (1/R) to the total.
- What is the quick formula for two resistors in parallel?
- Rp = (R1 × R2) / (R1 + R2) — the product over sum. Works only for two resistors.