Practical Electronics/Bipolar Transistors/NPN Transistor

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An NPN Transistor is made by joining one Positive-Typed Semiconductor in between two Negative-Typed Semiconductors. A Semi Conductor device that has three legs Base, Collector, and Emitter forming a bi-junction, namely BE and BC junctions

Left

An NPN Transistor has this symbol. The emitter leg has the arrow pointing outwards.

BJT symbol NPN.svg