Tellegen's theorem 1: Consider a lumped network n consisting of N+1 nodes and B branches, let=[ b2DbB,i=. Where

1 Find F(s) if f(t) = (a)(t-3);(b)4t u(t-3); (c)4 cos to(t-3). 2 Obtain partial-fraction expansions for each of the following rational functions, and find the corresponding time functions:

sequence. The balanced source supplies IMW and 0.2M VAR. If R, =12, find: (a) the line current;(b)Zp; ()the transmission efficiency

按照Ri的定义，在图2―33(b)电路的输 入端加一电压Ui，这时，从输入端看进去的电 阻为RB ‖rbe，因此Ri= RB

1. Augmented( incidence matrix of a directed graph nodes(N+1), branches(B)

1､一位二进制数值比较器 讨论：A和B相比较的情况有三种可能 在一些数字系统中,经常要求比较两个数字的大小。 为完成这一功能所设计的这种电路称为数值比较器

S14-2 Exponential Fourier series f(t)=+ cosot+a2 cos 2ot+.] sinot+ b2 sin

1、图：是结点和支路的集合 支路：抽象的线段（直线或曲线） 结点：支路的交点 电路的图：每一个元件用线段表示，US1和R1两支路，所以5个结点（b）

A A--connection three-phase sources a, b, c--line ter min als

Three-phase sources have three Q terminals called the line terminals(a, b,c). + Neutral connection--n an b+V n bn Balanced three-phase sources may