ENGR 2405 Chapter 3

# ENGR 2405 Chapter 3 - ENGR 2405 Chapter 3 Simple Resistive...

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1 ENGR 2405 Chapter 3 Simple Resistive Circuits

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2 Chapter 3 Homework #2 Edition 7 3.8, 3.11, 3.17a, 3.26, 3.27, 3.30, 3.45a, 3.50, 3.55 Edition 8 3.8, 3.11, 3.17a, 3.26, 3.27,3.44a, 3.49, 3.54, 3.55
3 Series Circuits

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4 Series Circuits The total resistance of a series circuit is the sum of the resistance levels. R eq = R T = R 1 + R 2 + R 3 + R 4 ….+ R N
5 Total Resistance (R T ) R T = R 1 + R 2 + R 3 + R 4 ….+ R N R T = 3 k + 1 k + 2 k = 6 k

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6 What is the value of R T ?
7 Total Current (I T ) Current is the same through series elements. I T = V / R T = 120V / 6 x 10 3 = 20 x 10 -3 A I T = 20mA

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8 What is the value of I?
9 Parallel Elements

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10 Parallel Elements
11 Total Conductance For parallel elements, the total conductance is the sum of the individual conductance. G T = + G 1 + G 2 + G 3 +… + G n

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12 Total Resistance Since G = 1/R, the total resistance for a network can be determined by the equation below
13 Total Conductance and Resistance G T = 1/R T = (1/3) + (1/6) = 3/6 = 1/2 S R T = 1/G T = 2

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14 Total Conductance and Resistance G T = 1/R T = (1/2) + (1/9) + (1/72) = 17/8 S R T = 1/G T = 8/17
15 Resistance 1/9k = (1/12k) + (1/R 2 ) 1/R 2 = (1/9k) - (1/12k) = (4/36k) – (3/36k) = (1/36k) R 2 = 36 k

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16 Total Conductance and Resistance The total resistance of a parallel resistor is always less than the value of the smallest resistor Additionally, the wider the spread in numerical value between two parallel resistors, the closer the total resistance will be to the smaller resistor
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## This note was uploaded on 04/15/2008 for the course ENGR 2405 taught by Professor Bittle during the Fall '08 term at North Texas.

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ENGR 2405 Chapter 3 - ENGR 2405 Chapter 3 Simple Resistive...

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