the short-circuit input impedance I12=0 the short-circuit forward current gain I1V2=0 Let 1=0 he open-circuit reverse voltage gain I1=0 the open-circuit output admittance

I Writing nodal equations by inspection determine v, in each circuit of Fig 2-32 6 A

Basic Circuit Theory ChpterI Problems 1 For the circuit of Fig. 1-26 find: V, i, and the power absorbed by the load

We define transfer function H(s) as a ratio of the Laplace transform of system output (or response)(s) to the Laplace transform of the input(or forcing function)v(s) when all initial conditions are zero, then

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

Example 2: (p175-12) resistor, capacitor, and voltage source=100cos300n are all in series. If the average power dissipated by the resistor is 150W and the rms capacitor voltage is 10v, determine R and C

Example 1: If 0=4v2 cos\tV, Z=2/600Q2 Find p(t)and P. Solution:

The Normal Distribution: the distribution of a continuous r.v. whose value depends on a number of factors, yet no single factor dominates the other. 1. Properties of the normal distribution: 1)The normal distribution curve is symmetrical around its mean valueu. 2)The PDF of the distribution is the highest at its mean value but tails off at its extremities

习题18-3 解:火车的固有长度为l=300m火车速度为v=100(km.h-)=250/9(m.s)

一、热力学(thermodynamics)的研究对象与研究方法 物态(state of matter):物质存在的物理状态 物质主要存在三种基本物理状态:固态、液态 和气态 热学是研究一切物态的热现象的学科,我们这里主 要研究气态,但有时也会牵涉到固态和液态。 从宏观上看,热学研究物体的宏观热现象:与温度有 关的物态的物理性质的变化。由观察和实验来总结热 现象的规律,得出热现象的宏观理论,这部分称为热 力学。 热力学利用宏观上可观测的物理量,如:,V,T 来研究热现象的规律