Analog Electronics
The β of a transistor is the ratio of the

 collect current to emitter current.
  collect current to base current.
 emitter current to collector current.
 base current to collector current.

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Analog Electronics
Optocouplers combine

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

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