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电子通信英语第一章.ppt

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电子通信英语第一章.pptponentsandtheirssymbolsUnit3DiodesUnit4TransistorsUnit5AmplifiersUnit6OperationalAmplifiersUnit7LogicGatesUnit8integratedcircuits(chips)onceptsofcircuittheoryVoltageandCurrentVoltageandcurrentarevitaltounderstandingelectronics,buttheyarequitehardtograspbecausewecan','push'or'force'oftheelectricity,itisn',,VVoltageisameasureoftheenergycarriedbythecharge.Strictly:voltageisthe"energyperunitcharge".,(orpowersupply).ponents,,,(zerovolts)Voltageisadifferencebetweentwopoints,butinelectronicsweoftenrefertovoltageatapointmeaningthevoltagedifferencebetweenthatpointandareferencepointof0V(zerovolts)[1].Zerovoltscouldbeanypointinthecircuit,(average),(amperes),(1amp)isquitealargecurrentforelectronics,somA(milliamps)(milli)means"thousandth":1mA=,or1000mA=1ACurrentismeasuredwithanammeter,,[2].ponents:onceptsofcircuittheoryInseries(F

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