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

An ideal transformer is a useful approximation of a very tightly coupled transformer in which the coefficient of coupling is almost unity and both the primary and secondary inductive reactance are extremely large in comparison with the terminating impedance

A current i at Li produces an open circuit voltage u,at L2s dyal

Frequency characteristics(Xi, xc,x,z, y, o vs o Z=R+A=R+(L+Xc)=R+ilo I

We assume=Im cos(t+a)i=Im cos(ot+B) The phase angle by which the voltage leads

《电路》（英文版）9-1 Instantaneous power

第一节 角度——数字传感器 第二节 超声波传感器 第三节 红外、激光传感器

8-2 Superposition, source transformation and Thevenin's theorem Superposition:

第一节 磁电式传感器的工作原理 第二节 磁电式传感器的结构和类型

8.1 复数 8.2 正弦量 8.3 正弦量的相量表示