Question

With reference to a semiconductor diode, what is meant by: 
(i) Forward bias
(ii) Reverse bias
(iii) Depletion region

Answer 1

(i)  Forward bias:  When a battery' is connected to a p-n diode such that the current is in the direction of diode current, the arrangement is called forward bias. 

(ii)  Reverse bias:  If the current flows opposite to the direction of diode current, this is called reverse bias. 

(iii) Depletion region:  In a p-n diode, the region in which electrons and holes neutralize each other is called depletion region or zone.