ࡱ> 7  bjbjUU ."7|7|}Ql $ $RK:::JJJJJJJJL jNJ::^:::JW=w+ KW=W=W=:6JW=:JW=RW=CV#J@J  ջ !<6cJ J"K0RKoJxOW=OJW=ETH curs VI Legea lui Ohm Consideram o ramura activa a unui circuit: ep-tensiunea electromotoare lp-bobina ce contine cuplaje magnetice cu toate bobinele care apartin circuitului din care face parte up se masoara in acelasi sens cu curentul Legea lui Ohm se scrie sub forma:  EMBED Equation.3  Daca ramura se considera generatoare tensiunea la bornele ei se masoara in sens invers curentului si legea lui Ohm in acest caz se modifica prin schimbarea semnului tensiunii la bornele ramurii. Daca semnalele excitatie sunt sinusoidale de pulsatie (, toate elementele fiind ideale si semnalele raspuns vor fi deasemenea sinusoidale si de aceeasi pulsatie (.  EMBED Equation.3  legea lui Ohm in domeniul complex:  EMBED Equation.3  Zpp-impedanta proprie a rangului p  EMBED Equation.3  Zpq-impedanta mutuala dintre ramurile p si q  EMBED Equation.3  1)Daca ramura nu contine cuplaje magnetice: Lpq=0(Zpq=0  EMBED Equation.3  2)Latura pozitiva: Ep=0  EMBED Equation.3  3)Latura este inchisa pe ea insusi: Up=0  EMBED Equation.3  Teoremele lui Kircoff I)Reprezinta o consecinta a conservarii sarcinii electrice in regim cvasistationar si se refera la nodurile unui circ electric.   EMBED Equation.3 -i1-i2+i3-i4+i5=0 Teorema de curenti [I] se aplica nodurilor independente intr-un circuit; ea va furniza n-1 ecuatii. Ecuatiile scrise pe baza t de ecuatii pot fi puse matricial sub forma [A][I]=0 II) Th. de tensiune se refera la ochiurile unui curent  EMBED Equation.3  Suma algebrica a tuturor laturilor care alcatuiesc ochiurile. Ca sens pozitiv se considera sensul arbitrar:  EMBED Equation.3  Suma algebrica a tensiunilor electromotoare din laturile E ale unui ochi este egala cu suma algebrica a caderilor de tensiune la bornele tuturor elementelor pasive din laturile ochiului analizat. Th de tensiune se aplica ocjiurilor independente, deci ea va furniza l-n+1 ecuatii.  EMBED Equation.3  Teorema conservarii puterilor:  EMBED Equation.3  Daca consideram ca pe un circuit de l laturi si scriem ecuatii similare pt toate acestea prin insumarea acestora obtinem:  EMBED Equation.3  Lpq Cp Lp Rp up ep i1 Cp i5 i4 Lpq Lp i3 Rp i2 up ep   GKLgh-./0*+ûûûðäÍÍðÁtðh[ûj'CJEHOJQJUj> CJUVaJjCJEHOJQJUj> CJUVaJ jwCJOJQJjCJEHOJQJUj>> CJUVaJjCJOJQJUCJH*OJQJ CJOJQJCJOJQJmHnHu5CJOJQJ\mHnHu jCJOJQJUmHnHu5CJOJQJ\# FGHIJf1&Sk,B$a$$a$} "#$%')STghij()*+,A|uq5\ jEHUjR> CJUVaJ jEHUj> CJUVaJ jUEHUj> CJUVaJ jH* j EHUj> CJUVaJ jUCJH*OJQJj> CJEHOJQJUjT> CJUVaJ CJOJQJjCJOJQJU,ABD ^ _ r s t u 䪝䑄xk_j9.> CJUVaJjCJEHOJQJUj-> CJUVaJj CJEHOJQJUj,> CJUVaJjCJEHOJQJUj> CJUVaJ5CJOJQJ\j|CJEHOJQJUj> CJUVaJjCJOJQJU CJOJQJ jCJOJQJUmHnHu5\%B / 0 ^ v W o p q r s t u v w x y z { | } $a$ W X k l m n } mH sH jq$CJEHOJQJUj'/> CJUVaJ CJOJQJjCJOJQJUj CJEHOJQJU-} ~   $a$,1h. A!"#$% DdpJ  C A? 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