Analog Electronics
The leakage electric current ICBO flows in

  the emitter and base leads.
  the base and collector leads.
  the emitter, base and collector leads.
  the emitter and collector leads.

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Analog Electronics
Optocouplers combine

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

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