Mesh analysis is applicable only to those networks, which are planar. If it is possible to draw the diagram of a circuit on a plane surface in such a way that no branch passes over or under any other branch, then that circuit is said to be planar circuit. (Non-planar-circuit

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

The voltage division The current division

The ideal voltage source and a series resistance comprise a practical voltage source

Any given arm of the Y network is found by taking the product of the two adjacent arms of the network and dividing by the sum of the network arms

The series combination of voltage sources: Several voltage sources in series may be replaced by an equivalent voltage source having a voltage equal to the algebraic sum of the individual sources

A point at which two or more elements have common connection is called node(节点). Suppose that we start at one node in a network and move through a simple element to the node at the other..., if no node was encountered more than once, then the set of nodes and elements that we have passed hrough is defined as path(路径)

Ohm's law states that voltage across many types of conducting materials is directly proportional to the current flowing through the material. U= Ri or R= i R--resis tance()( linear resistor) The resistor is a passive element that cannot deliver power or store energy

81-1 Introduction 1 Circuit models(模型) The voltage source Two active(有源) models The current source The resistor Three passive无源) models The inductor The capacitor

1.自动控制是一门不断发展的、综合性的技术科学 2.自动控制研究的内容及各部分的关系中 3.在实际工程应用和科学研究中发展自动控制 4.航天控制的发展方向