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In a pn junction, if diffusion current equals drift current, then why is there a potential barrier?

“In a [wiki]pn junction[/wiki], if diffusion current equals drift current, then why is there a potential barrier?”

Ans: When a [wiki]diode [/wiki]conducts, there is no [wiki]potential barrier[/wiki]

Uses of diodes

Sajin John asks:

“What is the job of diode in a circuit? How can we recognize it?”

Answer:

A diode is a two terminal electronic device which allows passage of current only in one direction.

A diode is used for rectification (converting ac to dc) and many other circuites

See the image of a diode on the left.

Read more on diodes at http://en.wikipedia.org/wiki/Diode

http://www.allaboutcircuits.com/vol_3/chpt_3/1.html

http://www.kpsec.freeuk.com/components/diode.htm

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