通信工程专业外语介绍二极管作文_通信工程专业介绍英文

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1、There are two types of standard transistors,NPN and PNP,with different circuit symbols.The letters refer to the layers of semiconductor material used to make the transistor.2、The leads are labelled base(B),collector(C)and emitter(E).These terms refer to the internal operation of a transistor.3、Transistors amplify currents,for example they can be used to amplify the small output current from a logic chip so that it can operate a lamp,relay or other high current device.In many circuits a resistor is used to convert the changing current to a changing voltage,so the transistor is being used to amplify voltage.4、A transistor may be used as a switch(either fully on with maximum current,or fully off with no current)and as an amplifier(always partly on).