The effective value of any periodic current is equal to the value of the direct current which flowing through a resistance R, delivers the same power to r as periodic current does

In either case, leading or lagging, we say that sinusoids are out of phase () if phase angles equal they are said to be in phase(同相)

The complete response is written as the sum of the forced and the natural response, and the initial conditions are then determined and applied to the complete response to find the values of the constants

一、万用表的使用 二、钳形电流表使用 三、兆欧表使用 四、常用仪器仪表

一、数制与编码 二、逻辑代数 三、基本逻辑门电路 四、汽车常用组合逻辑器件

1. 振荡条件 2. 起振和稳幅 3. 振荡电路基本组成部分

The over-damped response---- i()= A,+A, The critically-damped response-- i(t) =e (At+A2) The under-damped- response---it)e-(b1 cos+2 sino)

例1求以下函数的象函数 (1)单位阶跃函数 (2)单位冲击函数 (3)指数函数

A1, A,----two arbitrary constants S S2----real numbers or conjugate complex Since the s,t and s,t must be dimensionless, S,, S2----(1/s)

第一节 磁路的基本定律 第二节 常用铁磁材料及其特性 第三节 直流磁路的计算 第四节交流磁路的特点