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# 504 Note 3 for ECE 20100 at Purdue

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This 5 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Purdue University taught by a professor in Fall. Since its upload, it has received 17 views.

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Date Created: 02/06/15
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 2 Principle of power conservation Fonnl e g using results obtained above 2 Pabsorbed P1 P2 P3 Form 2 Pabsorbed 2 Pdelivere From the example above we have 3 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 21 Vo I Vi R 4 Conductance 1 G R unit Siemens S IS lQ mho 5 Open circuit i0 ORRw ORG0 o o l 6 Short circuit i lc v0 I V0 ORR0 v0 ER ORG 0 quot o l 4 Ohm s Law for passive sign convention I Ohm s Law V R1 or Va R it MEMORIZE IT 2 v0 i0 Ri2t VT 2 V 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 7 V Example R 1209 V 90 V What is I and P Practice Problem 3 Passive Sign Convention and Power Calculation 4V 5A F W 3V lv D E I 1 VAAT 2VB 7A ch0 4A 3 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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