Analog Electronics
The voltage follower has a

  small open - loop voltage gain.
  closed - loop voltage gain of unity.
  closed - loop bandwidth of zero.
  large closed - loop output impedance.

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

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