# lecture15 - DC Circuits DC DC Circuits Direct Current or...

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DC Circuits DC Circuits Series and parallel rules for resistors Kirchhoff’s circuit rules

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DC” Circuits DC” Circuits Direct Current or DC ”:  c urre nt a lwa ys  flo ws  in o ne   dire c tio n. Fo r c irc uits  c o nta ining  o nly re s is to rs  a nd e m f’s  the c urre nt is  a lwa ys  c o ns ta nt in tim e . C irc uits  c o nta ining   o the r e le m e nts  s uc h a s  c a pa c ito rs  a nd induc to rs  a s   we ll a s  re s is to rs  will ha ve  c urre nts  tha t c ha ng e  with tim e .   Alternating current or AC  is  c urre nt tha t re ve rs e s dire c tio n m a ny tim e s  (e g : 60 Hz c urre nt in C a na da ) a nd  will no t b e  tre a te d in this  c o urs e
Re s is to rs  in S e rie s Re s is to rs  in S e rie s R 1 R 2 R 3 1 1 V IR = 2 2 V IR = 3 3 V IR = A B We want to replace this combination by a single  resistor with resistance R eff A B R eff

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Same current
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lecture15 - DC Circuits DC DC Circuits Direct Current or...

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