Different metal containing compounds emit colored light when fireworks burn. This colored light is a combination of series of colors called spectral pattern.(谱带) Each element emits its own characteristic spectral pattern, which can be used to identify the element. This allowed the scientists in 1900s to develop models of the atom's internal structure

外研版（三起）（2012）小学英语四年级下册Module 2 Unit 2 It's very old.课件(1)

In the chapter we present resistive circuit analysis methods. The first is based on KCL and determines all the node-to-datum voltages in a given circuit and is known as node analysis. The second method, based on KVL, determines all loop current and is known as loop analysis. After discussing superposition, we will introduce Thevenin's and Norton's theorems

In the chapter, we shall define the basic active and passive circuit models, explain power conventions and determine when power is delivered and absorbed, state Ohm's law and Kirchhoff's law, determine the equivalent resistance of a passive circuit containing only resistors

Tellegen's theorem 1: Consider a lumped network n consisting of N+1 nodes and B branches, let=[ b2DbB,i=. Where

外研版（三起）（2012）小学英语四年级下册Module 2 Unit 2 It's very old.教案(2)

8-2 Superposition, source transformation and Thevenin's theorem Superposition:

外研版（三起）（2012）小学英语四年级下册Module 2 Unit 2 It's very old.习题

The operational amplifier (hereafter OP-AMP)is developed in the 1940s primarily for use in analog computers, made cheaply and readily available in the late 1960s through integrated-circuit technology. The actual construction of a modern OP-AMP is indeed very complex, involving many transistors, diodes, resistors and capacitors

外研版（三起）（2012）小学英语四年级下册Module 2 Unit 2 It's very old.习题(2)