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Unformatted text preview: BASIC ELECTRIC CIRCUITS BASIC ELECTRIC CIRCUITS George Haines, Instructor George Haines, Instructor Pima Community College W 9/01/2010 Chapter 3 Simple Resistive Circuits Practical Perspective Practical Perspective A Rear Window Defroster Chapter 3 Simple Resistive Circuits Chapter 3 Simple Resistive Circuits 3.1 Resistors in Series 3.2 Resistors in Parallel 3.3 The VoltageDivider and Current Divider 3.5 Measuring Voltage and Current 3.6 Measuring Resistance The Wheatstone Bridge 3.7 DeltatoWye (PitoTee) Equivalent Circuits Objectives Objectives 1. Be able to recognize resistors connected in series and in parallel and use the rules for combining series connected resistors and parallelconnected resistors to yield equivalent resistance. 2. Know how to design simple voltagedivider and currentdivider circuits. 3. Be able to use voltage division and current division appropriately to solve simple circuits. 4. Be able to determine the reading of an ammeter when added to a circuit to measure current; be able to determine the reading of a voltmeter when added to a circuit to measure voltage. Objectives (Continued) Objectives (Continued) 1. Understand how a Wheatstone bridge is used to measure resistance. 2. Know when and how to use deltatowye equivalent circuits to solve simple circuits. 3.1 Resistors in Series 3.1 Resistors in Series Two elements connected at a single node, are said to be in series. Seriesconnected circuit elements carry the same current (KCL). i s = i 1 = i 2 = i 3 = i 4 = i 5 = i 6 = i 7 , therefore, if we know any one current, say i s , we know all of them. To find i s , we apply KVL around the single loop: v s + i s R 1 i s R 2 + i s R 3 + i s R 4 + i s R 5 + i s R 6 + i s R 7 = or, v s = i s (R 1 + R 2 + R 3 + R 4 + R 5 + R 6 + R 7 ) R eq = R 1 + R 2 + R 3 + R 4 + R 5 + R 6 + R 7 v s = i s R eq R eq = i=1 k R i = R 1 + R 2 + + R k Resistors in Series (Concluded) Resistors in Series (Concluded) 3.2 Resistors in Parallel3....
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 Spring '08
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