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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