Analog Electronics
Optocouplers combine

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

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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.
  majority carrier flow in the emitter region.
  minority carrier flow in the emitter region.

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