Discussion
What does voltage series feedback do to the input impedance?
Answer: D
A series-returned voltage opposes the source, so less current flows for the same applied voltage and the input impedance rises by the factor of one plus the loop gain. Shunt return would lower it instead. Nothing is left unchanged by feedback, and the feedback resistance does not set the impedance directly. Series raises and shunt lowers at the input, which is half of the rule that covers all four topologies. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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