In the figure of transistor as a switch, the VBB supply can be varied from 0 V to 5 V - Physics - Semiconductor Electronics Materials Devices And Simple Circuits

Question

I n   t h e   f i g u r e   o f   t r a n s i s
t o r   a s   a   s w i t c h ,   t h e  
V B B   s u p p l y   c a n   b e   v a r i e d
  f r o m   0   V   t o   5   V
  T h e   S i   t r a n s i s t o r   h a s
  β d c = 250   a n d   R B = 100 k Ω , R
C = 1 k Ω , V C C =   5   V   A s s u m e
  t h a t   w h e n   t h e   t r a n s i s t o
r   i s   s a t u r a t e d ,     V C E  
=   0   V   a n d   V B E   =   0 8
  V   C a l c u l a t e     ( a )   T h e
  m i n i m u m   b a s e   c u r r e n t ,   f
o r   w h i c h   t h e   t r a n s i s t o r  
w i l l   r e a c h   s a t u r a t i o n   H e n c
e     ( b )   D e t e r m i n e   V i   w
h e n   t h e   t r a n s i s t o r   i s   s w
i t c h e d   o n     ( c )   F i n d   t
h e   r a n g e s   o f   V i   f o r   w
h i c h   t h e   t r a n s i s t o r   i s   '
s w i t c h e d   o f f '   a n d   ' s w i t c h e
d   o n '

Shashi Kumar · Accepted Answer

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