Semikart's Parallel and Series Resistor Calculator provides a convenient and precise solution for calculating the equivalent resistance of resistors in parallel or series configurations. This tool is essential for engineers, hobbyists, and electronics professionals who need accurate results for their circuit designs. By entering the resistor values, you can quickly determine the total resistance, saving time and ensuring reliability in your projects. Bookmark this page to access the calculator easily whenever needed and streamline your electronics calculations.
Illustration of current division in parallel circuits
When resistors R1 , R2 , and others are connected in parallel, the total resistance is always less than the smallest individual resistor.
R1
R2
The reciprocal of the total resistance is the sum of the reciprocals of the individual resistances.
For two resistors R1 and R2 in parallel:
1 / Rtotal = (1 / R1) + (1 / R2)
For multiple resistors R1 , R2 , R3 , ... in parallel:
R3
1 / Rtotal = (1 / R1) + (1 / R2) + (1 / R3) + ... + (1 / Rn)
Illustration of voltage division in series circuits
When resistors R1 , R2 , and others are connected in series, the total resistance is simply the sum of the individual resistances.
In a series circuit, the same current flows through all resistors, but the voltage is divided among them.
For two resistors R1 and R2 in series:
Rtotal = R1 + R2
For multiple resistors R1 , R2 , R3 , ... in series:
Rtotal = R1 + R2 + R3 + ... + Rn
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