Transistor / Bipolar junction transistor (BJT)
a three-terminal semi-conductor device that switches or amplifies electrical signals
Base
transistor terminal that controls current flow from the emitter to the collector
Emitter
transistor terminal that emits current to the collector
Collector
transistor terminal that collects current from the emitter
Amplifier
an electronic device or circuit that increases the magnitude of an input signal
Gain
ratio between the output signal and the input signal
Silicon-Controlled Rectifier (SCR)
a three-terminal semi-conductor device that utilizes 4-layers of semiconductor material to control current flow
Gate
terminal of an SCR that serves as the control point
Gate current
amount of current to the gate needed to turn on an SCR
Holding current
amount of current flowing through the anode-cathode circuit needed to keep the SCR in the “ON” state
