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Calculating Resistance in Series and Parallel Circuits

Calculating Resistance in Series and Parallel Circuits. Basic Formulas for Rapid Computation of Circuit Resistance. Topics of Discussion. Resistance totaling values, dependent on the circuit structure Knowing how to calculate resistance depending on circuit structure

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Calculating Resistance in Series and Parallel Circuits

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  1. Calculating Resistance in Series and Parallel Circuits Basic Formulas for Rapid Computation of Circuit Resistance

  2. 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

  3. Resistance Rules for Series Circuits • Series circuits are always one-for-one additive • Rt = R1 + R2 + R3 + Rn

  4. Series Circuit • Sample of a Series Circuit layout R1 R2 R3

  5. 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

  6. Resistance Rules for Parallel Resistance Circuit • Parallel circuits are reciprocally additive • Rt = 1 1 + 1 + 1 R1 R2 R3

  7. Parallel Circuit • Sample of a Parallel Circuit layout R2=30W R1=20W R3=50W

  8. R2=30W R1=20W R3=50W 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 + 0.033W + 0.02W • Rt = 1/.103W = 9.70W

  9. 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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