# Lab 2 - TEXAS A&M UNIVERSITY ENGR 111B Foundations of...

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TEXAS A&M UNIVERSITY ENGR 111B: Foundations of Electrical & Computer Engineering Lab 2: KVL / KCL and DC Motor Modeling Team Members: _________________________ _________________________ Section Number: __________ Team Number: __________ This Lab is due by the Beginning of the Next Lab Session. Written By: Lorne Liechty Alex Johnson Guided By: Dr. Jeff McDougall Dr. Narasimha Reddy Dr. Hank Walker Concepts built upon the original Tekbot labs designed by Oregon State University

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Lab 2: KVL / KCL and DC Motor Modeling Time Limit: 2 weeks OVERVIEW Congratulations on beginning your fun and exciting career as a student of Electrical or Computer Engineering. In order to begin even the most basic laboratory exercise it is necessary to review a few fundamental principles. This lab will cover the following material. - Schematics - Resistor Combinations: Series and Parallel - Protoboards - KVL, KCL, and Ohm’s Law - Measuring Voltage, Current, and Resistance BACKROUND To assist students in completing the exercises required by this lab, the following background information has been provided. It is recommended that each student read all of the following information as a beneficial review of the topics required. SCHEMATICS, PARALLEL and SERIES CONNECTIONS Schematics are a fundamental tool utilized in most electronic projects. Schematics describe the components used in a circuit and their relative electronic orientation. Schematics can be highly complex and show every connection all the way down to individual transistors on a microprocessor, or they can be general and show simply the basic connections of circuit elements. Below is a schematic that, by the end of this lab, you will be expected to analyze: Figure B1: A simple circuit schematic Written by Texas A&M University 2
Written by Texas A&M University 3

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Again, here is the same schematic with labels on each element for your reference: Figure B2: Labeling of simple circuit In this schematic each voltage source and resistor represents an individual circuit element. Other circuit elements that will be introduced throughout the course of this semester include capacitors, inductors, and transistors. These circuit elements are connected in four different ways: series, parallel, Y, and delta. In this lab, we will only deal with series and parallel element combinations. To avoid confusion it may be important to mention that the ground symbol attached to the bottom of the circuit is not an actual circuit element, but is rather a reference. The placement of the ground identifies the node designated to have zero volts and other voltages in the circuit are stated relative to the ‘ground’ node. One method to identify whether or not circuit elements are connected in series or parallel is to first identify the nodes of the circuit. In the circuit we have been viewing, there are three nodes. Two of the nodes in this circuit are labeled in the schematic above.
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