Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 Power transistor and silicon transistor.
 SITs and BJTs.
 IGBTs and MOSFETs.

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

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

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