SOLUTION

BJT (Bipolar Junction Transistor) is not a voltage-controlled device.

• MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and JFET (Junction Field Effect Transistor) are both voltage-controlled devices. Their conductivity is controlled by applying voltage to their gate terminals.
• IGBT (Insulated Gate Bipolar Transistor) is also a voltage-controlled device. It combines the high input impedance of a MOSFET with the high current output handling capability of a BJT, controlled by the voltage applied to its gate.
• BJT (Bipolar Junction Transistor), however, is current-controlled. The amount of current flowing through the collector is primarily determine by the base current.