# Calculating Resistance in Series and Parallel Circuits - PowerPoint PPT Presentation

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## Calculating Resistance in Series and Parallel Circuits

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### Calculating Resistance in Series and Parallel Circuits Basic Formulas for Rapid Computation of Circuit Resistance Introduction Informational lecture by Fred Baker ... – PowerPoint PPT presentation

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Title: Calculating Resistance in Series and Parallel Circuits

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

2
Introduction
• Informational lecture by Fred Baker
• Electronics Instructor for U.S. Navy

3
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

4
Resistance Rules for Series Circuits
• Series circuits are always one-for-one additive
• Rt R1 R2 R3 Rn

5
Series Circuit
• Sample of a Series Circuit layout

R1
R2
R3
6
Solving for Series Resistance
• Calculate the resistance using the series
formula
• Rt R1 R2 R3 Rn
• Rt 20W 30W 50W 100W

R120W
R230W
R350W
7
Resistance Rules for Parallel Resistance Circuit
• Parallel circuits are reciprocally additive
• Rt

1 1 1 1 R1 R2 R3
8
Parallel Circuit
• Sample of a Parallel Circuit layout

R120W
R230W
R350W
9
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

10
Summary
• Determine the type of circuit layout you are
working with
• Apply the correct formula
• Verify answer by double-checking math