5. ch3 3.1-3.7 9_06_10 X

5. ch3 3.1-3.7 9_06_10 X - BASIC ELECTRIC CIRCUITS BASIC...

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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 Voltage-Divider and Current- Divider 3.5 Measuring Voltage and Current 3.6 Measuring Resistance ◦ The Wheatstone Bridge 3.7 Delta-to-Wye (Pi-to-Tee) 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 parallel-connected resistors to yield equivalent resistance. 2. Know how to design simple voltage-divider and current-divider 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 delta-to-wye 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. Series-connected 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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This note was uploaded on 10/27/2010 for the course ECE 220 taught by Professor Strickland during the Spring '08 term at Arizona.

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5. ch3 3.1-3.7 9_06_10 X - BASIC ELECTRIC CIRCUITS BASIC...

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