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Part of Made in India,
Design Innovation
Workshop,2015
A	
  Fresh	
  New	
  Experience	
  in	
  
Project-­‐Making	
  &	
  ...
PHYSICSINVESTIGATORY
PROJECTON
TOUCHACTIVATEDSWITCH
What	
  if	
  your	
  body	
  becomes	
  a	
  part	
  of	
  the	
  circuit	
  and	
  a	
  
current	
  is	
  passed	
  thro...
Have	
  a	
  look	
  at	
  what	
  we	
  provide	
  in	
  our	
  Project	
  Kit!
CoolJunk	
   is	
   India's	
   fastest	
...
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Physics Investigatory Project on Touch Activated Switch

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Physics Investigatory Project on Touch Activated Switch

  1. 1. Part of Made in India, Design Innovation Workshop,2015 A  Fresh  New  Experience  in   Project-­‐Making  &  Learning!
  2. 2. PHYSICSINVESTIGATORY PROJECTON TOUCHACTIVATEDSWITCH
  3. 3. What  if  your  body  becomes  a  part  of  the  circuit  and  a   current  is  passed  through  it?  Well,  you  can  do  this  using  a   touch  acFvated  switch  circuit. In  this  project,  you  will  need  a  breadboard,  an  LED,  a   transistor,  a  resistor  and  a  few  connecFng  wires.  The   connecFons  were  made  such  that  a  wire  was  connected   to  the  base  of  the  transistor  and  another  wire  was   connected  to  the  Vcc  (posiFve/high  voltage).  The  other   ends  of  both  the  wires  were  leP  open.  It  was  observed   that  when  the  two  connecFng  wires  were  pressed,  the   LED  glows.    The  harder  you  press  it,  the  more  will  be  the   intensity  with  which  the  LED  glows.  Now,  the  voltages   across  the  base-­‐emiQer  juncFon  and  the  collector-­‐emiQer   juncFon  were  measured  using  a  mulFmeter.  It  was  found   that  that  the  voltage  at  the  base  was  greater  than  the   voltage  at  the  collector  which  verified  that  the  transistor   was  in  the  saturaFon  state  and  acted  as  a  switch. The  reason  why  the  LED  glows  is  because  our  body  acts  as   a  part  of  the  circuit  when  we  hold  the  wires.  It  offers  a   resistance  in  the  base-­‐emiQer  circuit,  the  value  of  which   may  vary  between  40,000  Ω  to  1,000,000  Ω.    When  the   wire  is  pressed  harder,  the  area  of  contact  with  the   connecFng  wires  will  increase.  Consequently,  the  effecFve   resistance  offered  by  our  body  decreases  and  the  current   increases.    This  makes  the  base-­‐emiQer  juncFon  forward   biased,  due  to  which  a  small  current  flows  through  the   transistor.  The  transistor  is  in  the  saturaFon  region  and   acts  as  a  switch.  As  a  result,  its  collector  and  emiQer   juncFon  is  approximately  equal  to  zero  volts.  A  collector   current  flows  in  the  collector-­‐emiQer  circuit.  The  current   gets  a  closed  path  and  the  LED  glows.  
  4. 4. Have  a  look  at  what  we  provide  in  our  Project  Kit! CoolJunk   is   India's   fastest  growing  DIY  (do-­‐it-­‐yourself)   kits   company   focused   on   project-­‐based   learning   in   science,  engineering  and   technology.  Having   20,000   users   in   India,  US,   Singapore,   Middle   East   and   New   Zealand,  the  CoolJunk  kits  are  known  for  quality,  innovaFon  and  high  producFon  value.  CoolJunk  has  been   featured   in   naFonal   and   internaFonal   journals   including   Wallstreet,   Yourstory,   Hindu   Business   Line,   NextBigWhat  and  was  tagged  as  the  coolest  Indian  start-­‐up  in  IAN  Bootcamp-­‐2011.   You  may  also  refer  to  the  video:  Touch  Ac?vated  Switch For  more  projects  visit  our  website:  CoolJunk   All  tools  and  components   in  one  box. Step  by  step  visual   instrucFons Detailed  experiment   theory CoolJunkCoolJunkCoolJunk Follow  us  on: CoolJunk

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