ENTC 4350

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ENTC 4350

• HOMEWORK SET 4
• Chapter 6

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Chapter 6, Problem 1.

• A copper wire, 45 cm long, has a cross-sectional
  area of 0.05 cm2. Calculate its resistance.
  (Hint The resistivitiy of copper is 17 x 10-8 W.

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Chapter 6, Problem 1.
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Chapter 6, Problem 3.

• In the Wheatstone bridge shown in Figure 6-24,
  assume that R1 1.5 kW, R2 780 W, R3 990 W,
  and R4 1.2 kW. Find the output voltage when an
  excitation voltage of 5 V dc is applied.

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Chapter 6, Problem 3.
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Chapter 6, Problem 4.

• A blood pressure transducer is based on the
  Wheatstone bridge. The sensitivity is nominaly
  rated at 50 mV/(Vmm Hg). Find the output
  voltage if an excitation potential of 7.5 V and
  a pressure of 100 torr is applied. Note 1 torr
  1 mm Hg.

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Chapter 6, Problem 4.
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Chapter 6, Problem 5.

• A 40-mm length wire has a resistance of 100 W.
  When a tension is applied, the resistance changes
  to 80 W and the length becomes 40.04 mm.
  Calculate the gauge factor.

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Chapter 6, Problem 6.
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Chapter 6, Problem 6.
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Chapter 6, Problem 9.