Electronics Questions

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Chapter 1

1. 20,1,3: Shouldn't the output voltage get larger as $R_{L}$ gets smaller?

• No.$R_{O}$ is in series with $R_{L}$, so if $R_{L}$ gets smaller, there will be a smaller voltage drop over $R_{L}$ and a larger voltage drop over $R_{O}$

1. 21, F1.18: Why does it have to have an source impedance? How big is this impedance? Loading effects? Could we get rid of this if we had superconducting wires?
2. 31,1,5: Why are the output resistances placed where they are? It seems there would be a voltage drop over the voltage amplifier and extra current not being accounted for in the current amplifier?