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Conduction in solids Part- 2: basic electronics

20:52


Conventional Currents and electron flow

In the early years of electrical experimentation it was believed that a positive charge represented an increased amount of electricity an that a negative charge was a reduced quantity. Consequently current was assumed to flow from positive to negative charge . This is convention that remains in use today even though current is now known to be movement of electrons from negative to positive.
Current flow from positive to negative is referred to as the conventional current direction.


Electron flow from the negative to positive is known as the direction of electron  flow.


It is important to understand both electron flow and conventional current direction . The operation of electronic devices is explained in terms of the electron movement. However , every graphic  symbol used to represent an electronic device has an arrowhead which indicates conventional current direction.
Consequently electronic circuits are most easily explained by using current flow from positive to negative.

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