3 parallel resistors calculator

Do you need a three parallel resistors calculator? You're in luck, here's one to get the equivalent resistance of this configuration of resistors in a circuit.

Its operation is very simple and all you have to do is write the resistance in Ohms of each of the three resistors and when you have it, press the calculate button to obtain the result instantly, without the need for manual calculations.

Connection of resistors in parallel

Connection of resistors in parallel

The parallel connection of resistors is characterized by the following features the input terminals of each of the resistors are connected to each other. Similarly, in a parallel resistor configuration, the output terminals are also connected to each other.

Because of this, the same voltage passes through all resistorsi.e., they have the same voltage drop. This is because the ends of each of the resistors are connected to the same point in the circuit and therefore share the same voltage.

However, the total current flowing through the resistors in parallel is equal to the sum of the currents flowing through each resistor:

IT = I1 + I2 + ... + In

Differentiating a parallel connection from a series connection is easy. In a series resistor configuration, the output terminal of one is connected to the input terminal of the next. You have more information on series connection of resistors in the link I just left you.

Calculation of parallel resistors: formula

Parallel resistor formula

For calculate the equivalent resistance of several parallel resistors connected, we must apply the formula above these lines.

To avoid making mistakes in the calculations, it is best to break the formula into two steps. First we calculate the sum of the inverses of each resistor and, when we have the result, we calculate its inverse to know the equivalent resistance.

Solved exercise on parallel resistors

By example,In the following figure, we are going to calculate the equivalent resistance of a configuration like the one we have in the following figure:

Example of parallel resistors

First stepCalculate the sum of the inverses of each resistor. Thus, we have that:

  • R = (1/20) + (1/30) + (1/30) = 0.116 Ohms

Second stepCalculate the inverse of the resistance just obtained:

  • Req = 1 / 0.116 = 8.571 ohms

Therefore, we can replace the 20, 30 and 30 ohm resistors with a single 8.571 ohm resistor.

Calculation of three parallel resistors online

Parallel Resistor Calculator

If we want to solve the previous example but using our three parallel resistors calculator onlineIf you want to use a resistor, you only have to fill in the value of each resistor in the corresponding field. The order in which you write it is irrelevant so you don't have to respect it.

When you have written the value of the three parallel resistorsSimply press the calculate button and you will automatically get the result without the need to apply the formula for calculating parallel resistors.

This saves you time and, above all, calculation errors.

2 thoughts on “Calculadora de 3 resistencias en paralelo”

    • Hello Roberto,

      I didn't quite understand you, what exactly would you like us to do? It's just that the calculator already shows the resulting resistance of the parallel circuit but I don't know if you mean something else.

      Tell us and we will study it :)

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