Question 1

Do units matter?

Accepted Answer

Only consistency matters. If you input all resistors in ohms, the result is in ohms as well.

Question 2

Can series and parallel be combined?

Accepted Answer

Yes for circuits that can be reduced stepwise. This calculator is for supported configurations; for complex circuits you may need iterative reduction.

Question 3

What if a resistor value is zero?

Accepted Answer

Zero ohms in parallel effectively shorts the circuit branch and can make the equivalent resistance approach zero.

Resistor Calculator

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