ECE 201 - Hw 03 - F11

# ECE 201 - Hw 03 - F11 - 3 R 5 R i s(t Friday Figure 1 Model...

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Homework 3 Due: Monday, August 29 1 (a) Assuming that the relative resistivity of nickel with respect to copper is 5 . 1, and the absolute resistivity of copper at room temperature is 1 . 7 × 10 8 Ω · cm, ﬁnd the resistance of a nickel ribbon with the following dimensions: length of 40 m, width of 1 . 5 cm, and thickness of 0 . 1 cm. (b) Compute the resistance of 600 feet of 14-gauge 1 copper wire (2 . 575 Ω / 100 ft) (c) Repeat (b) for 400 feet of 14-gauge nickel wire. (d) If one end of the copper wire from (b) is soldered to one end of the nickel wire from (c), ﬁnd the total resistance of the 1000 feet of wire. 2 For the circuit of Figure 1 assume that R = 1 Ω, and the input current to the circuit is i s ( t ) = 200 sin (10 πt ) mA for t > 0 and zero for t < 0. Compute the instantaneous power delivered by the source. Using a graphing program, plot the power delivered as a function of time for 0 < t < 1 sec. 2 R

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Unformatted text preview: 3 R 5 R i s (t) Friday, August 26, 2011 Figure 1: Model circuit 1 American wire gauge, also known as the Brown & Sharpe wire gauge, is a standardized wire gauge system used since 1857 predominantly in the United States and Canada for the di-ameters of round, solid, nonferrous, electrically conducting wire. You can read more on this at http://en.wikipedia.org/wiki/American wire gauge 1 3 The power delivered to the source in the circuit of Figure 2 is 120 watts. (a) If I s = 2 A, determine the value of R . (b) Suppose now that R = 1 Ω. Find I s . Figure 2: Model circuit 4 For the circuit in Figure 3, determine the current I out and the power P R 2 absorbed by the resistror R 2 , in terms of the current I in and the resistances R 1 and R 2 and the parameter μ . Friday, August 26, 2011 Figure 3: Model circuit 2...
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ECE 201 - Hw 03 - F11 - 3 R 5 R i s(t Friday Figure 1 Model...

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