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
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