Analog Electronics
The emitter electric current in a junction with normal bias

  is equal to ICBO.
  changes greatly by a small changes in collector bias voltage.
  is almost equal to the base current.
  is equal to the sum of IB and IC.

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Analog Electronics
Pinch-off voltage in a JFET is

 the gate to source voltage that gives zero drain current.
 the gate to source voltage that gives unity drain current.
 the drain voltage that gives zero drain current.
 the drain voltage that gives infinite drain current.

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