Semiconducting Devices Question 43

Question: The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If VB = 5 V, then the maximum value of R so that the voltage is above the knee point, will be

Options:

A) 4.3 kW

B) 860 kW

C) 4.3 W

D) 860 W

Show Answer

Answer:

Correct Answer: A

Solution:

At knee point voltage across the diode is 0.7V.

Hence voltage across resistance R is 5 - 0.7 = 4.3 V.

Therefore using V = iR

Therefore 4.3 = 1 x 10-3 x R

Therefore R = 4.3 kW.



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