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

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

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 voltage division The current division

One of the main uses of Thevenin's and Norton's theorems is the replacement of a large part of network very simple equivalent

Equation is satisfied when=. The maximum power is=

The voltage follower is a circuit in which the output is identical to the input

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