What is electric current
What is electric current ? what is its unit ? define Ampere.
Electric current-When electric charges is in motion , they constitute what is called an electric current . electric current is defined as the rate of flow of charge through an area of the conductor . if Q is the charge flows through a conductor in time T then electric current I = Q/T
Or I= dQ /dt . unit of current is Ampere .
We can define 1 Ampere is the current flowing through a conductor when 1 Coulomb of charge flows through a conductors in unit time.
In the terms of drift velocity current I = n e A Vd where n is the charge density , A is the area of cross-section of the conductor , e is the charge on electron and Vd is the drift velocity.
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In terms of Ohm’s law – current I = V/R V is the potential difference across the conductor and R is the resistance of the conductor .
So we can say 1 Ampere current flows through a conductor when unit potential difference setup across a conductor of resistance 1 Ohm .