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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