Parallel Resistors Calculation
The parallel resistor online calculator can calculate the resistance of 2 to 4 resistors connected in parallel. The units should be consistent in the calculation.
Enter the resistance value of a single resistor:
The calculation formula of the resistance of parallel resistors is: 1/R = 1/R1 + 1/R2 + 1/R3 + ... 1/Rn
For example, if the four resistors are 10Ω, 10Ω, 100Ω, and 100Ω respectively, the resistance R after parallel connection is:
1/R=1/10+1/10+1/100+1/100
1/R=22/100
R≈4.5Ω
Two typical applications of parallel resistors:
1. No suitable resistor: When you can't find a resistor with a suitable resistance, you can get it by connecting multiple resistors in parallel.
2. The power of the resistor does not meet the requirements: For example, if a 1W 25Ω resistor is needed in the circuit but it is not available, you can use four 1/2W 100Ω resistors in parallel to replace it. In order to ensure uniform power distribution, the resistance values of the four resistors should be as consistent as possible.