lab0_u11_intro - University of Florida Department of...

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University of Florida EEL 3111 — Summer 2011 Drs. E. M. Schwartz & R. Srivastava Ode Ojowu, TA Page 1/9 Revision 2 18-May-111 Lab 0: Introduction to Circuits Laboratory OBJECTIVES To gain skills in using basic electrical laboratory equipment such as meters and power supplies. (These skills will be needed in subsequent electrical engineering laboratories and in industry.) To become familiar with and be able to use a breadboard and the LabVIEW ELVIS equipment (on which the lab breadboard sits). To learn the resistor color code to determine radial resistor values. To learn how resistor combine in series and in parallel. To learn the limits of the operation of components and equipment. To learn to record data and report experimental results, i.e., to effectively communicate what you have done and observed. To gain self-confidence in your capabilities in an electrical laboratory. To become safety conscious in a laboratory environment. MATERIALS Printouts (required) of the below documents: The lab assignment (this document), Lab Rules and Policies, Lab Safety, Parts List, Intro to myDAQ A plastic bag will be given to you in lab containing all the parts on your parts list. A breadboard and a wire kit will also be given to you in lab. A myDAQ (a measurement and control device) with a DVD with myDAQ software, ELVIS software, and MultiSim will be given to you in lab AFTER you have registered at the following website: http://www.seniordesign.ece.ufl.edu/ . Use “Senior Design” for the course. INTRODUCTION Resistance and Color Codes Unit of Resistance : The SI unit of resistance is the Ohm, and the unit symbol is the capital Greek letter omega  Unit prefixes are used for writing convenience. For example, the prefixes k and M represent 10 3 and 10 6 , respectively. Thus, 33,000 is written as 33 k (33 kilo-ohms), and 1,200,000 as 1.2 M (1.2 mega-ohms). Resistance Nominal Values and Tolerances : Resistor manufacturers print resistance values on resistor casings either in numerical form or in a color code. These values are only nominal values . They are only approximately equal to the actual resistances. The possible percentage variation of resistance about the nominal value is called the tolerance . The popular carbon-composition resistors have tolerances of 20, 10, 5, 2, and 1 percent, which means that the actual resistances can vary from the nominal values by as much as 20% of the nominal values. Color Code : The most popular resistance color code has nominal resistance values and tolerances indicated by the colors of either three or four bands around the resistor casing, as shown in Fig. 1. (Sometimes there is a fifth band, not considered here, for failure rate.) The colors of the first and second bands correspond, respectively, to the first two digits of the nominal resistance. The first digit is never a zero. The color of
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lab0_u11_intro - University of Florida Department of...

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