Title: Facilitator Help Page: Quiz 5-7 -- (Do Not Publish)
Course: Basic Electrical Theory and Wiring (Sandbox) > Section: Module 5: Resistance

Lab 5-7 Quiz Answers

1. \(R_{Tot}=\frac{1}{\frac{1}{270}+\frac{1}{270}}=\frac{1}{0.003704+0.003704}=\frac{1}{0.007408}=135Ω\)
  1. The student should measure between 128 and 142 Ω.
2. \(R_{Tot}=\frac{1}{\frac{1}{240}+\frac{1}{270}+\frac{1}{240}}=\frac{1}{0.004167+0.003704+0.004167}=\frac{1}{0.012056}=83Ω\)
  1. The student should measure between 76 and 90 Ω
3. \(R_{Tot}=\frac{1}{\frac{1}{470}+\frac{1}{560}+\frac{1}{390}}=\frac{1}{0.002128+0.001786+0.002564}=\frac{1}{0.006478}=154Ω\)
  1. The student should measure between 147 and 161 .
4. \(R_{Tot}=\frac{1}{\frac{1}{270}+\frac{1}{390}+\frac{1}{560}+\frac{1}{240}}=\frac{1}{0.003704+0.002564+0.001786+0.004167}=\frac{1}{0.012221}=82Ω\)
  1. The student should measure between 75 and 89 Ω.
5. There will be differences. Most often the measured value is lower. Also, each resistor has a tolerance. Most of ours are + or - 5%.

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