Where does the majority of current flow in a transistor with both the emitter-base and collector-base circuits connected?

In a transistor, particularly in bipolar junction transistors (BJTs), the majority of current flow occurs from the emitter to the collector. This happens because the transistor is designed to allow current to be controlled by the input at the base terminal.

When both the emitter-base and collector-base circuits are connected, the majority carriers from the emitter (in an NPN transistor, these are electrons) flow towards the collector. The base terminal is very thin and lightly doped compared to the emitter. Consequently, when a voltage is applied to the base, it allows a small current to flow into the base, which enables a much larger current to flow from the emitter to the collector, effectively amplifying the current.

This principle underlies the operation of transistors, making them essential for various applications such as amplification and switching in electronic circuits. Therefore, the current primarily flows from the emitter through to the collector in this configuration, aligning with how transistors amplify signals.