lecture 3 - electrical and electonic principles

8/17/2019 Lecture 3 - Electrical and Electonic Principles

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Electrical andElectronic

PrinciplesLECTURE # 3BYHYATT QURESHI


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Recap

• Finding Eecti!e resistance

• E"plain CL


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In t$is lect%re& 'o% (ill learn )

• Application o* irc$$o+s ,oltage La(


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Belo( is a single loop circ%it T$e ,L co/p%tation ise"pressed grap$icall' in t$at !oltages aro%nd a loop s%//ed %p .' tra!ersing 45g%rati!el' (al0ing aro%n

t$e loop


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I/portant 7 sign con!ention

T$e ,L e8%ation is o.tained .' tra!ersing a circ%it loin eit$er direction and (riting do(n %nc$anged t$e!oltage o* eac$ ele/ent ($ose -92 ter/inal is entere5rst and (riting do(n t$e negati!e o* e!er' ele/ent:!oltage ($ere t$e /in%s sign is 5rst /et T$e loop /start and end at t$e sa/e point It does not /atter ('o% start on t$e loop


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Assigning signs

;ote t$at a c%rrent direction /%st $a!e .een assume T$e ass%/ed c%rrent creates a !oltage across eac$resistor and 5"es t$e position o* t$e -92 and -


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=irection o* c%rrent

T$e !oltages in t$e loop /a' .e s%//ed in eit$erdirection It /a0es no dierence e"cept to c$ange allsigns in t$e res%lting e8%ation >at$e/aticall' spea0its as i* t$e ,L e8%ation is /%ltiplied .'


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;ote t$at a c%rrent direction /%st $a!e .een assume T$e ass%/ed c%rrent creates a !oltage across eac$resistor and 5"es t$e position o* t$e -92 and -

lecture 3 - electrical and electonic principles

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