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# Online shunt resistance calculator - resistance calculation

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Online online resistance is connected to the calculator, and up to 10 resistance values can be input in parallel.

The parallel resistance online calculator can calculate the resistance of 2 to 4 resistors in parallel, and the unit should be consistent in the calculation.

The formula for calculating the resistance of the parallel resistor is:

$$1/R_ and=1/R1+1/R2+1/R3+...1/Rn$$

For example: 10Ω, 10Ω, 100Ω, 100Ω, the resistance of four resistors in parallel is R and is:

$$1/R_ and=1/10+1/10+1/100+1/100$$

$$1/R_ and =22/100$$

$$R_ and ≈4.5Ω$$

Another example: 820Ω, 1.5kΩ two resistors in parallel after the resistance R and is:

$$1/R_ and = 1/820+1/1500$$

$$1/R_ and =116/61500$$

$$R_ and ≈530.2Ω$$

Two typical applications for shunt resistors:

1.There is no suitable resistor: when a resistor with a suitable resistance is not found, it can be obtained by connecting multiple resistors in parallel.

2.The resistance power does not meet the requirements: For example, if a 1W 25Ω resistor is needed in the circuit and there is no hand, then four 1/2W resistors with 100Ω resistance can be used in parallel to replace the power distribution evenly, four The resistance of the resistor should be as uniform as possible.