Definition
The rate of flow of electric charge through any cross
sectional area is called electric current.Electric current deals with electric
charge and electric charge passes in the circuit or in any wire due to the rate
of flow of electrons.
Unit
The SI unit of electric current is Ampere and Ampere is
defined as one coulomb per second in any cross sectional area.The reading of
electric current is measured with an ammeter which shows the current rating in
amperes.
Uses
Electric current also causes joule heating which is used in
incandescent lamp and also use to make magnetic fields in motors and
generators.
Symbol OF Electric Current
The symbol of electric current is I which is generated from
current intensity.The I symbol is used by Andre-Marie Ampere when the unit of
electric current was named.
The formula of Electric Current is derived from Ohms law
“Ohms law states that the current
passing through a conductor is directly proportional to the potential
difference applied across its end provided the temperature and the physical
state of a conductor remains the same”.The following relationship of current is
formed by Ohms law:
Here I is the current which is measured
in amperes,V is the voltage and R is the resistance.
Type
The electric current is classified into
its two types which are as given below
- Alternating current
- Direct Current
Alternating Current
Alternating current an electric current
which is reverse in direction and changes its amount with respect to time.
Direct current
Simply the direct current is defined as
an electric current which always flows in one direction and doesn't changes its
value or amount.
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