What is the significance of arrow in the transistor symbols?

Answer 1

There a two types of bipolar transistors

PNP and NPN .

This refers to the doping elements used in the silicon components of this 3 layer device with base always in the middle.

The arrow is the emitter wire and shows direction of conventional current flow(pos to neg)

NPN transistors (generally used in negative earth circuits) have the arrow pointing away from the base connection

PNP transistors ( generally used in circuits with positive earth) have the arrow pointing towards the base connection.

Answer 2

The arrow - in transistor diagrams or diagrams of other electronic pieces - shows the direction of conventionalcurrent flow - that is to say, the flow or equivalent flow of positive particles. In pieces where electricity is carried by holes (which have a positive charge), it shows the real direction in which these holes move. In pieces in which electricity is carried by electrons (which have a negative charge), the arrow points in the direction opposite to the electron flow.

Answer 3

The arrow is the emitter wire and shows direction of conventional current flow