Analog Electronics
The input signal for an instrumentation amplifier usually comes from

 a resistor.
 a differential amplifier.
 an inverting amplifier.
 a Wheatstone bridge.

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decreases in both input & output impedances
Decrease in input impedance & increase in output impedance
Increase in both input & output impedances
Increase in input impedance & decreases in output impedance

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