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Published byAlycia Blondell Modified over 3 years ago

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**Calculating Resistance in Series and Parallel Circuits**

Basic Formulas for Rapid Computation of Circuit Resistance

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**Introduction Informational lecture by Fred Baker**

Electronics Instructor for U.S. Navy

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Topics of Discussion Resistance totaling values, dependent on the circuit structure Knowing how to calculate resistance depending on circuit structure Understanding these basics can save valuable time and effort

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**Resistance Rules for Series Circuits**

Series circuits are always one-for-one additive Rt = R1 + R2 + R3 + Rn

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Series Circuit Sample of a Series Circuit layout R1 R2 R3

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**Solving for Series Resistance**

Calculate the resistance using the series formula: Rt = R1 + R2 + R3 + Rn Rt = 20W + 30W + 50W = 100W R1=20W R2=30W R3=50W

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**Resistance Rules for Parallel Resistance Circuit**

Parallel circuits are reciprocally additive Rt = 1 R R2 R3

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**Parallel Circuit Sample of a Parallel Circuit layout R1=20W R2=30W**

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**Solving for Parallel Resistance**

Calculate using reciprocal formula: Rt = 1 / 1/R1 + 1/R2 + 1/Rn Rt = 1/1/20W + 1/30W + 1/50W Rt = 1/0.05W W W Rt = 1/103W = 9.70W R1=20W R2=30W R3=50W

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**Summary Determine the type of circuit layout you are working with**

Apply the correct formula Verify answer by double-checking math

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