100S11_PS3

# 100S11_PS3 - ENES 100 Introduction to Engineering Design...

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ENES 100 Introduction to Engineering Design Spring 2011 1/5 Problem Set #3 Assigned: Feb. 11, 2011 Due: In class on Feb. 21 (M) or Feb. 22 (Tu) Reading: Chapter 4: Basic Circuits and Sensors To receive full credit, you must show and explain your calculations. Problems: 1. Imagine that on your hovercraft, you will be using a downward-pointing light-emitting diode (LED) to illuminate the floor surface. The figure below shows how you might control the LED using an Arduino, and the equivalent circuit diagram.

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ENES 100 Introduction to Engineering Design Spring 2011 2/5 The LED that you are using is model SLR-343, made by Rohm Semiconductor. The following graph was taken from the data sheet of this LED: The maximum current that this LED can handle (without damage) is 20 mA. To be safe, you have decided to operate the LED at a current of 10 mA. (a) Using the data shown in the graph above, what resistor (R) should you choose in order to obtain a current of 10 mA? (b) Under these conditions, how much electrical power is consumed by the LED? (c)
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## This note was uploaded on 04/03/2012 for the course ENES 100 taught by Professor Jacob during the Spring '08 term at Maryland.

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100S11_PS3 - ENES 100 Introduction to Engineering Design...

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