A 1N755 Zener diode is connected (in reverse biased mode) in seri

A 1N755 Zener diode is connected (in reverse biased mode) in seri
| A 1N755 Zener diode is connected (in reverse biased mode) in series to a 620 Ω resistor and a 20 V DC supply. Calculate the diode current.

A. 20.16 mA

B. 12.16 mA

C. 28.49 mA

D. 30.12 mA

Please scroll down to see the correct answer and solution guide.

Right Answer is: A

SOLUTION

Concept:

A 1N755 is a 400 mW silicon linear diode with a Zener breakdown voltage of 7.5 V, i.e. the voltage across the Zener diode after breakdown remains constant at 7.5 V.

Analysis:

The given situation can be drawn as:

Applying KVL across the circuit we get:

20 - VZ - 620 × I = 0

20 - 7.5 - 620 × I = 0

620×I = 12.5

\(I=\frac{12.5}{620}A\)

I = 20.16 mA

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