Snani reads in class-Xll Science. She has read semiconductor in his NC

Snani reads in class-Xll Science. She has read semiconductor in his NCERT Physics text book. On the basis of that she knows that electronic appliances operate at very low voltage' But at home she observes daily that her father using wall socket of 220 V for charging mobile. She is confused and put her doubt in front of teacher. The teacher explains doubt properly. Now she is satisfied and shares the knowledge with her classmates.(a) What are the values displayed by Sudha ?(b) What is the principle of a charger ?(c) How does the d.c. current gain of a transistor change, if the width of the base region is increased ?

Answer»

(a) The values displayed by Sudha are :

(i) curiosity,

(ii) creativity, and

(iii) sharing knowledge.

(b) Charger acts as a rectifier, which changes a.c input signal into unidirectional d.c. output signal.