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Chapter 1 Introductory Linear Circuit Analy Chapter 1 Introductory Linear Circuit Analysis *k ----From time-domain analysis to frequency-domain analysis -From time-domain analysis to frequency-domain analysis Cl-1: Introduction to Linear Circuit Analysis =1A. V=5V Consistent reference direction (related reference direction) CLumped Parameter Hypothesis, Basic Approaches, v(t) v(t) Basic parameters V=5v=-5V Basic Terminology, Reference direction P=V>0? Dissipative element <0? Active element Fundamental Law(KVL, KCL, VCR) Once the reference direction is defined, you dont eed to change it. Consistent reference direction If result>0: the actual direction follows the reference y(t (related reference direction) If result<0: the actual direction opposites the reference Chapter l Introductory Linear Circuit Analysis Tea break/ Cl-I: Introduction to Linear Circuit Analysi pLumped Parameter Hypothesis, Basic Approaches, Basic parameters Basic Terminology, Reference direction, Fundamental Law(KVL, KCL, VCR) Fundamental Law (KVL, KCL, VCr) Fundamental Law(KVL, KCL, VCR) Law of Conservation of Charge(Gauss's Law)dJg/s=0 Another description: Kirchhoff's first law: ( Kirchhoffs Current Law(KCL)) Kirchhoffs first law; (Kirchhoffs Current Law (KCL) At any point in an electrical circuit that does not represent a capacitor According to the convention that every current flowing towards the plate, the sum of currents flowing towards that point is equal to the point is positive and that every current flowing away is negative(or um of currents flowing away from that point. the other way around), this principle can be stated as: 2i(toO That is: Eiin (to=2out(to) ①+21 ①+[ h l2=l3+l5 2-l2-160 4[5[61 (4)北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 Consistent reference direction (related reference direction) + v(t) - i(t) *** C1-1:Introduction to Linear Circuit Analysis Lumped Parameter Hypothesis, Basic Approaches, Basic Parameters, Basic Terminology, Reference direction, Fundamental Law (KVL, KCL, VCR) Chapter 1 Introductory Linear Circuit Analysis ----From time-domain analysis to frequency-domain analysis 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 I=1A,V=5V Vab=5V a b V=-5V ? P=VI > 0 ? < 0 ? Dissipative element Active element Once the reference direction is defined, you don’t need to change it. If result>0: the actual direction follows the reference. If result<0: the actual direction opposites the reference. + v(t) - i(t) a b + v(t) - i(t) Chapter 1 Introductory Linear Circuit Analysis *** ----From time-domain analysis to frequency-domain analysis Consistent reference direction (related reference direction) 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 Tea break! 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 C1-1:Introduction to Linear Circuit Analysis Lumped Parameter Hypothesis, Basic Approaches, Basic Parameters, Basic Terminology, Reference direction, Fundamental Law (KVL, KCL, VCR) Chapter 1 Introductory Linear Circuit Analysis ----From time-domain analysis to frequency-domain analysis 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 Fundamental Law (KVL, KCL, VCR) Kirchhoff's first law : (Kirchhoff's Current Law (KCL)) At any point in an electrical circuit that does not represent a capacitor plate, the sum of currents flowing towards that point is equal to the sum of currents flowing away from that point. That is: ∑ijin(t0)=∑ijout(t0) ① 1 2 3 4 5 6 ② ③ (4) Law of Conservation of Charge (Gauss’s Law ) *** I2 = I3 + I5 J dS = 0 ∫∫Ò g 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 Another description: Kirchhoff's first law : (Kirchhoff's Current Law (KCL)) According to the convention that every current flowing towards the point is positive and that every current flowing away is negative (or the other way around), this principle can be stated as: ∑i(t0)=0 ① 1 2 3 4 5 6 ② ③ (4) Fundamental Law (KVL, KCL, VCR) I2-I3-I5=0
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