Discussion
Feedback that samples the output voltage and returns it in series with the input raises the input impedance and ______ the output impedance.
Answer: D
It lowers the output impedance, because sampling the output voltage makes the amplifier work to hold that voltage steady whatever the load draws. The two effects follow from two independent rules - series raises at the input, voltage sampling lowers at the output - and together they define the voltage amplifier this topology produces. Reading a topology's two words as instructions gives both impedance directions without any memorisation. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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