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Linear Circuit Analysis I

by: Cassidy Casper

Linear Circuit Analysis I ECE 20100

Cassidy Casper
GPA 3.59


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This 5 page Class Notes was uploaded by Cassidy Casper on Saturday September 19, 2015. The Class Notes belongs to ECE 20100 at Purdue University taught by Staff in Fall. Since its upload, it has received 36 views. For similar materials see /class/207904/ece-20100-purdue-university in Electrical Engineering & Computer Science at Purdue University.


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Date Created: 09/19/15
ECE201 Linear Circuit Analysis I Topics Resistance Ohm s Law power dependent sources 1 Review of Passive Sign Convention FAB V AB X I AB power absorbed by circuit element with terminals labeled A and B Practice Problem 1 Given a twoterminal element how many different ways can you mark the polarity of voltage and the direction of current Of these which 0nes follow the Passive Sign Convention Hint Draw your answers Practice Problem 2 Compute power absorbed or dissipated by elements 1 2 3 Which elements could be the sources of the circuit H int For each circuit element redraw current and voltage to follow passive sign convention Equot Equot Principle of power conservation Form 1 e g using results obtained above 2 Pabsorbed 131 P2 P3 Penn 2 From the example above we have Resistor amp Resistance 1 What is Resistance Resistor a device or a circuit element that impedes the ow of current This property is called resistance 2 unit Ohm Q 19 1 VA 3 symbol 39R 4 Conductance 1 G R unit Siemens S IS lQ mho 5 Open circuit ai0 9i0 0 0 ORR00 V ORG0 V I R 70 7 6 Short circuit i A 1gt 9 V0 I F0 ORRO vo ER ORGoo I 70 4 Ohm s Law for passive sign convention I Ohm s Law V R1 or Va R it MEMORIZE IT 2 v0 i0 Ri2t VR For dc direct current where V and I are constant P 12R E 2 P or pt gt 0 for all Rs ie a resistor always absorbs power 3 I IRVP gt R Knowing the values of any 0 m 0 two is suf cient Example R 1209 V 90 V What is I and P Practice Problem 3 Passive Sign Convention and Power Calculation 4V 5A 6 REMEMBER i Always label current and voltage using passive sign convention ii power absorbed power dissipated 7 power generated l A generates 20 W of power nd VA 2 Find the power absorbed by B 3 If element C generates 3W of power nd Vc 4 If element D absorbs 27W of power nd ID 5 If element E absorbs 2W ofpower nd IE 6 Find the power absorbed by element F Answer to Practice Problem 3 1VA5V 2PB14W 3Vc 1V 41D 9A 51E2A 6PF 20W 5


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