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

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
Medium input resistance and high output resistance
Low input resistance as well as output resistance
High input resistance and low output resistance

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