How To Calculate Resistance In A Parallel Circuit With 3 Resistors

By | January 21, 2023



For those of us who are electrical engineers and hobbyists alike, understanding how to calculate resistance in a parallel circuit can provide valuable insight into the behavior of our electrical components.

We all know that an electrical circuit is composed of a power source and various devices like resistors, capacitors, and other materials that conduct electricity. With that said, when components are wired in the same direction, they are usually connected in series, but when they are wired in multiple directions, they are generally connected in parallel.

However, calculating resistance in a parallel circuit with three resistors can be challenging if you don't know the basics. So, let's start by breaking this down into two steps:

Step #1: Calculate the total resistance of the three resistors.

This is relatively simple; just add up the resistance value of each resistor to get the total resistance. For example, if you have three resistors with 10 ohms (Ω) resistance each, then the total resistance of the three would be 30 Ω.

Step #2: Calculate the individual resistances of each resistor.

To do this, you'll need to use Ohm's Law, which states that voltage (V) is equal to current (I) times resistance (R). From there, you can rearrange the equation to get R = V/I. Now we can calculate the individual resistance of each resistor by plugging in the known variables.

For instance, if we have one resistor with 10 Ω of resistance and two other resistors with 20 Ω of resistance each, then the total resistance would be 50 Ω. To calculate the individual resistances of each resistor, we can use the equation above and solve for R. In this case, it would look something like this: R1 = 50 Ω / 3, R2 = 50 Ω / 3, and R3 = 50 Ω / 3.

Once you understand these basic steps, calculating resistance in a parallel circuit with three resistors is easy to do. Knowing how to do this is a great first step in becoming an electric engineer or hobbyist, as understanding electric circuits is an essential component of any successful project.

So, now that you understand the basics of calculating resistance in a parallel circuit with three resistors, why not take it a step further and explore some of the advanced topics?


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