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The formula for calculating the equivalent resistance of parallel resistors

1/Rtotal = 1/R1 + 1/R2 + ... + 1/Rn

Taking the reciprocal yields the total resistance.

Simplified formula for calculating parallel resistance

In addition to the standard formula mentioned above, there are simpler methods for calculating parallel resistance under specific conditions.

1. When parallel resistors have the same resistance value, let the resistance be R and the quantity be n, then:

Rtotal = R / n


2. When there are only two resistors in parallel:

Rtotal = R1 * R2 / (R1 + R2)

Resistors in parallel refer to the connection of multiple resistors at both ends to form a common node, which is considered as a whole. This configuration is often used for setting specific resistance values, current division, etc., and is very common in electronic product design, hardware debugging, and maintenance.

In a parallel resistor circuit, the voltage across all resistors is the same, and the total current through the entire circuit is the sum of the currents through each resistor. The total resistance is less than the resistance value of any individual resistor.

Parallel Resistance Calculator
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