diodes

underwhich condition zener diode act as a regulator? why?

http://en.wikipedia.org/wiki/Zener_diode

bq). "Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. When connected in parallel with a variable voltage source so that it is reverse biased, a zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. From that point on, the relatively low impedance of the diode keeps the voltage across the diode at that value."

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Here is a hint, all diodes have similar characteristics as a zener and Zener diode are specifically designed to enhance a typical diode characteristic, otherwise it is just a diode. So if you know anything about a diode this just answer yOur question.

zener diode is a special kind of diode it has much higher concentration level than ordinary diode when it is applied in parallel with a device than at higher voltage level zener breakdown occurs and all the current get bypass through the zener diode thus saving the equipment from excessive higher voltage stress

Zener diode is heavily doped diode. So in reverse bias condition when you increase the potential across the diode, due to zener affect at break down voltage, it starts conducting where as the voltage across the diode remains the same. Because of this property, it is connected in parallel to a device whose voltage level has to be maintained constant.
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A zener diode is always operated in its reverse biased condition. A voltage regulator circuit can be designed using a zener diode to maintain a constant DC output voltage across the load in spite of variations in the input voltage or changes in the load current.

Zener diode is heavily doped diode. So in reverse bias condition when you increase the potential across the diode, due to zener affect at break down voltage, it starts conducting where as the voltage across the diode remains the same. mcdvoice.onl

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zener diode is heavily doped diode. So in reverse bias condition when you increase the potential across the diode, due to zener affect at break down voltage, it starts conducting where as the voltage across the diode remains the same.job application

a zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. From that point on, the relatively low impedance of the diode keeps the voltage across the diode at that value." job application

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zener diode is a special kind of diode it has much higher concentration level than ordinary diode when it is applied in parallel with a device than at higher voltage level zener breakdown occurs and all the current get bypass through the zener diode thus saving the equipment Bookzz from excessive higher voltage stress

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