How To Find The Total Resistance Of A Series Parallel Circuit

How to Find the Total Resistance of a Series-Parallel Circuit

A series-parallel circuit is a circuit that contains both series and parallel connections. To find the total resistance of a series-parallel circuit, you can use the following steps: 1.

Find the total resistance of the series resistors.

To do this, add the resistances of the resistors together. 2.

Find the total resistance of the parallel resistors.

To do this, use the following formula: ``` 1 / Rtotal = 1 / R1 + 1 / R2 + ... + 1 / Rn ``` where Rtotal is the total resistance of the parallel resistors, and R1, R2, ..., Rn are the resistances of the individual resistors. 3.

Add the total resistance of the series resistors to the total resistance of the parallel resistors to find the total resistance of the series-parallel circuit.

Here is an example of how to find the total resistance of a series-parallel circuit. Consider the following circuit:

A series-parallel circuit diagram.

This circuit contains two resistors in series (R1 and R2) and two resistors in parallel (R3 and R4). To find the total resistance of this circuit, we first need to find the total resistance of the series resistors. ``` Rseries = R1 + R2 = 10 Ω + 20 Ω = 30 Ω ``` We then need to find the total resistance of the parallel resistors. ``` 1 / Rparallel = 1 / R3 + 1 / R4 = 1 / 5 Ω + 1 / 10 Ω = 3 / 10 Ω ``` So, the total resistance of the parallel resistors is 10 / 3 Ω. Finally, we add the total resistance of the series resistors to the total resistance of the parallel resistors to find the total resistance of the series-parallel circuit. ``` Rtotal = Rseries + Rparallel = 30 Ω + 10 / 3 Ω = 40 Ω ``` So, the total resistance of this series-parallel circuit is 40 Ω. ## Tips for Finding the Total Resistance of a Series-Parallel Circuit Here are a few tips for finding the total resistance of a series-parallel circuit: * When adding the resistances of resistors in series, the units of resistance must be the same. For example, if you are adding resistors with resistances in ohms, you must convert any resistances in kiloohms or megohms to ohms before adding them. * When adding the resistances of resistors in parallel, the units of resistance do not matter. You can add resistances in ohms, kiloohms, or megohms without having to convert them first. * When you are adding the resistances of resistors in series-parallel circuits, it is often helpful to draw a diagram of the circuit. This will help you to visualize the relationships between the resistors and make it easier to find the total resistance. ## Conclusion Finding the total resistance of a series-parallel circuit can be a bit tricky, but it is not impossible. By following the steps in this article, you can easily find the total resistance of any series-parallel circuit.


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