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

1.A functionf(t) is said to be even iff(t)=(-t). They are symmetrical with respect to the vertical axis. (bn=0)

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

sinusoidal current or voltage at a given frequency is characterized by only two parameters an amplitude and a phase angle. The complex representation of the voltage or current is also characterized by these same two parameters

1. Nonlinear resistor A nonlinear resistor is an element whose voltage and current are related by a nonlinear equation

《电路》课程学习指导（含题解，d220d25ec3d145f995e5a52aaa4cab20）第七章 相量法

We select one node as a reference node and then define a voltage between each remaining node and the reference node

Let us assume a solution i(t=Ae, where a and S, are constant to be determined

(a)Find V, in Fig. 8-20.(b)To what identical value should each of the 4Q2 resistors be changed so that V2 is 180 out of phase with the source voltage?

1 If the voltage across a 5F capacitor is 2te -V, find the current and the power 2 In 5s, the voltage across a 40mF capacitor changes from 160v to 220V. Calculating the average current through the capacitor