Asked by kirtichawla94 | 14th Aug, 2009, 06:34: PM

Expert Answer:

In a metallic conductor such as a copper wire, there are plenty of free electrons moving around, colliding with each other and moving randomly.

When a potential difference is applied or set up across the two terminal of the copper wire, free electrons move in specific direction and when say a electric currrent is flowing through it.

Voltage is short term for potential difference.

So we can differentiate with following points.

1/ Electric current is charge flowing per unit time, I = Q/t, while potential difference = Difference between potentials between two points/terminals. Potential = Electric Potential Energy/Charge.

2/ The SI unit of electric current is Ampere, abbreviated as A, while the SI unit of potential difference is J/C which is called volts, abbreviated as V.

3/ Electric Current is a base quantity, while potential difference is derived.




Answered by  | 15th Aug, 2009, 10:06: AM

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