What would happen if in reverse bias of a pn junction diode voltage greater than/equal to breakdown voltage is applied? Consider a zener diode with breakdown voltage 3V(just take as example).If we directly connect it with a voltage supply of 4V what would happen?I read that voltage across zener diode remains constant after breakdown. It means if we connect the 3V zener diode to 4V supply a potential drop of 3V would occur across zener diode, then what about the remaining 1V, where would it drop?If I am wrong and istead of 3V, whole 4V drops across zener then how could it give us constant DC voltage as it would change above breakdown?How could the zener diode be used then as a voltage regulator? Please explain in detail I am having a lot of confusions regarding semiconductor devices specially in pn junction diodes. Thank You.