SSC SCIENCE QUESTIONS THAT CAN COME + NCERT NOTES

Zener diode
A heavily doped p-n junction diode which work  in the break down region is called a zener diode.

Zener diode as a voltage regulator

A zener diode can be used as voltage regulator or voltage stabilizer to provide a constant voltage from a source whose voltage may fluctuate over a wide range.when the input voltage is increase resistance of zener diode decrease and hence the current through the diode increase to high value
As a result of this large voltage drop occurs across the dropping resistance R.hence the output voltage across RL is maintain to the desire value.when the input voltage decrease through the diode also decrease.so now small voltage drop take place across the resistance R and the output voltage across RL is maintain at the desire constant value.

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