Q. The graph given below represents the $I$-$V$ characteristics of a zener diode. Which part of the characteristics curve is most relevant for its operation as a voltage regulator?

A) $ab$
B) $bc$
C) $cd$
D) $de$
Explanation

(d) When reverse bias is increased the electron field across the junction also increases. At some stage the electric field becomes so high that it breaks the covalent bonds creating electron-hole pairs. This mechanism is known as zener breakdown. In breakdown region for a long range of load ($R_{L}$) the voltage remains the same though the current may be large.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

Want more practice?
Practice Semiconductor Electronics MCQs