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

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

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  electron flow in the emitter region.
  conventional electric current flow in the emitter region.
  minority carrier flow in the emitter region.
  majority carrier flow in the emitter region.

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