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Unformatted text preview: R sensor changes its value linearly from 30 k Ω to 130 k Ω as a function of temperature over the range-25 ◦ C to + 25 ◦ C. The nominal temperature of the cavern is 0 ◦ C. In this type of circuit, the voltage V C-V B is a measure of how the temperature changes. Suppose that V s = 50 V, and in k Ω, R 1 = 40, R 2 = 88, R 3 = 40 and R 4 = 25. Note that the 88 k Ω resistor is a result of manufacturing tolerances that often permit deviations from a nominal of, say, 90 k Ω, by as much as 20%. As usual, it is cost versus precision. (a) Write a set of nodal equations in the variables V B and V C . (b) Assuming R sensor = 80 k Ω at 0 ◦ C, put the nodal equations in matrix form and solve for the node voltages, V B and V C . (c) Determine the power delivered by the source. Figure 3: Model circuit for Problem 3. 2...
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This note was uploaded on 12/13/2011 for the course ECE 201 taught by Professor All during the Fall '08 term at Purdue.
- Fall '08