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Standard XII

Physics

Zener Diode

In the case o...

Question

In the case of p-n junction diode at a high value of reverse bias voltage, the current rises sharply. The value of reverse bias voltage is known as

cut-off voltage

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zener voltage

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inverse voltage

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critical voltage

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Solution

The correct option is B zener voltage
In reverse bias of p-n junction when a high voltage is applied, electric breakdown of junction takes place, resulting in a large increase in reverse current. This high voltage applied is called zener voltage.

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Similar questions

Q. In a p-n junction diode, the current I can be expressed as

I = I_{0} e x p (\frac{e V}{2 K_{B} T} - 1)

, where

I_{0}

is called the reverse saturation current,

V

is the voltage across the diode and is positive for forward bias and negative for reverse bias, and

I

is the current through the diode,

k_{B}

is the Boltzmann constant

(8.6 \times 10^{- 5} e V / K)

and

T

is the absolute temperature. If for a given diode

I_{o} = 5 \times 10^{- 12}

A

and

T = 300 K

, then
(a) What will be the forward current at a forward voltage of

0.6 V

?(b) What will be the increase in the current if the voltage across the diode is increased to

0.7 V

?(c) What is the dynamic resistance?(d) What will be the current if reverse bias voltage changes from

1 V

2 V

Q. In the case of p-n junction diode at a high value of reverse bias voltage, the current rises sharply. The value of reverse bias voltage is known as

Q. In the case of p-n junction diode at a high value of reverse bias, the current rises sharply. The value of reverse bias is known as

Q. Why the current under reverse bias essentially voltage independent up to a critical reverse bias value and then increases sharply?

Draw V-I characteristics of a p-n junction diode. Answer the following questions, giving reasons :
(i) Why is the current under reverse bias almost independent of the applied potential upto a critical voltage?
(ii) Why does the reverse current show a sudden increase at the critical voltage?
Name any semiconductor device which operates under the reverse bias in the breakdown region.

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In the case of p-n junction diode at a high value of reverse bias voltage, the current rises sharply. The value of reverse bias voltage is known as

The correct option is B zener voltage In reverse bias of p-n junction when a high voltage is applied, electric breakdown of junction takes place, resulting in a large increase in reverse current. This high voltage applied is called zener voltage.

The correct option is B zener voltage
In reverse bias of p-n junction when a high voltage is applied, electric breakdown of junction takes place, resulting in a large increase in reverse current. This high voltage applied is called zener voltage.