Why is a silicon diode better than a germanium diode in a rectifier circuit?

A diode as a rectifier converts

A diode rectifier

A silicon and a germanium diode has identical physical dimensions. The band gap in silicon is larger than that in germanium. An identical reverse hlas is applied across the diodes.

(i) calculate the value of output voltage V_(0) and current I if silicon diode and germanium diode conduct at 0.7V and 0.3 V respectively. Fig. (ii) If now germanium diode is cinnected to 12 V in reverse polarity, find new values of V_(0) and I .

How is a zener diode different than an ordinary diode?

Write a short note on "Diode as a rectifier".