ENES100_PS3_soln_S09

# ENES100_PS3_soln_S09 - ENES 100 Introduction to Engineering...

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ENES 100 Introduction to Engineering Design Problem Set 3 Spring 2009 Assigned: 2/13 Due Date: 2/23 or 2/24 Reading: Chapter 4 of the course text on basic electric circuits Problems: Problem #1. Let’s consider the NXT sensor circuit shown in Figure Ex4.11 of the text. Hint: Voltage divider rule is useful to solve the following problems. (a) If you place a 5 k Ω resistor across the terminals of one of the NXT analog sensor inputs (say pins 1 and 2), what voltage will you measure across that resistor (when the NXT is turned on)? Solution: (b) How much current will flow through the internal 10k Ω resistor? Solution: (c) If you want to measure 1V across one of the NXT sensor inputs, what value of resistance should you connect across those two sensor inputs? Solution: (d) Assuming that you could place any resistance across the NXT sensor inputs, what are the maximum and minimum voltages that you could measure across those sensor inputs? Indicate the correspondence between the resistance and the voltages.

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ENES 100 Introduction to Engineering Design Problem Set 3 Spring 2009 Solution: From, In the limit of . A maximum voltage of 5 Volts is read when the input resistor has very large value (>> 10k Ω ). In the limit of . A minimum voltage of 0 Volts is read when the input resistance is zero. (The pins are shorted.) (e) As in d) assuming that you could place any resistance across the NXT sensor inputs, what
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