15-1割集 一、图的基本概念

14-1非正弦周期电流电路 1.非正弦周期电流的产生定义:随时间按非正弦规律周期变化的电流或电压

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

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

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

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

Let us first define a linear element as passive element that has a linear voltage-current relationship

Equation is satisfied when=. The maximum power is=

UB =A(DA-UB) =cons tant The inverting OP-AMP circuit

Let=R3 and The result we have found for two /R =k, we have inputs may be extended to any v2=-k(v1+3) number of inputs