A simple working examples of a PNP (left) and a NPN (right) transistor circuit. With independent circuit layouts. Controlled by a SPST switch which allows a low controlling current ("base current") through the BASE of the transistor. The controlled current through the EMITTER/COLLECTOR then drives a LED.
The controlled current always flows in the opposite direction of the emitter arrow symbols for proper junction biasing (polarity between emitter/collector). The sum of the emitter current is equal to the base and collector currents.
I recommend turning OFF the "conventional current" setting to observe "electron flow." It's best to observe electron flow when working with semiconductors.
