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

Find the resonant frequency arallel resonance

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

Let us now define resonance. In a two-terminal electrical network containing at least one inductor and one capacitor, resonance is the condition which exists when the input impedance of the network is purely resistive

6.5 汽车空调系统的维修 6.6 汽车空调系统的故障诊断

邢台职业技术学院：汽车运用与维修专业《汽车电气设备原理与检修》课程教学资源（PPT课件讲稿）教学指南

sinusoidal voltage: V =V29 A sinusoidal current: I= We define the complex powerS=vi=V∠9,I∠-9 =V∠,-=V∠=+ jVI sin=P+j P=VIcos 9 --active(average) power

①主电路保护的设置 这里所讲的保护，主要是针对电源变换装置里 的器件，需要保护的状态包括：过电压、过电流、 过热等

1.电气控制系统的原理设计及工艺设计 2. C534JI立车横梁电气控制系统设计