# homework1 - well as the Norton current and resistance I N...

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Physics 334, Winter Quarter 2012 Homework Assignment 1 Due Tuesday January 10 in class or in my mail box before the end of class. 1. Exercise 1.5 in the textbook with this twist: If the circuit is allowed to include capacitors and inductors, find a counter-example circuit to the problem premise and explain your reasoning. 2. You are given a “black box” with two terminals and proceed to measure its “I-V” curve, finding the following two points on the curve: (2I b , V b ) and (I b , 5V b ). (a) Accurately sketch the “I-V” curve. (b) From this curve, find the Thévenin voltage and resistance V Th and R Th , as
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Unformatted text preview: well as the Norton current and resistance I N and R N . 3. A “black box” with 3 terminals labeled E, B and C is shown in the circuit below. Assume terminal B is magically always 0.6 V more positive than terminal E, and I d is very large compared to the current flowing into terminal B. (FYI, this black box is an NPN bipolar transistor.) (a) Find V C and V E . (easy to do) (b) Find R 1 and R 2 . Hints: “Assume terminal B is always 0.6 V more positive than terminal E, …” implies what “dynamic” resistance between terminals B and E? And why does it help that I d is relatively large?...
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