Sources are not all the same in the way they specify the output voltage. Some assume...

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Electrical Engineering

Sources are not all the same in the way they specify the outputvoltage. Some assume that a load with a resistance matching theoutput resistance is always present when you set the voltage. Otherdevices assume there is a high impedance load on the output. Whichof the cases match the voltage settings for Elvis II? Explain youranswer

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4.2 Ratings (571 Votes)

The short answer input impedance is high ideally infiniteOutput impedance is low ideally zero But what does this meanand why is that usefulImpedance is the relationship between voltage and current Itsa combination of resistance frequencyindependent resistors andreactance frequencydependant inductors and capacitors Tosimplify the discussion lets just assume that all our impedancesare purely resistive so impedance resistanceYou already know that resistance relates voltage and current byOhms lawEIREIRor maybeREIREIThat is one ohm means that for each volt you get one ampereWe know that if we have a resistor of 100100 and we have acurrent of 1A1A then the voltage must be 100V100VThe concept of input and output impedance are very nearlythe same thing except we are concerned only with the relativechange in voltage and current That isREIREIIf we are talking about the input impedance of an opamp we aretalking about how much more current will flow when voltage isincreased or how much less current will flow when voltage isdecreased So See Answer

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