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Part of Made in India,
Design Innovation
Workshop,2015
A	
  Fresh	
  New	
  Experience	
  in	
  
Project-­‐Making	
  &	
  ...
PHYSICSINVESTIGATORY
PROJECTON
LDRASVARIABLERESISTOR
Have	
  you	
  seen	
  the	
  Volkswagen’s	
  talking	
  newspaper	
  
ad?	
  	
  An	
  LDR	
  (light	
  dependant	
  resi...
Have	
  a	
  look	
  at	
  what	
  we	
  provide	
  in	
  our	
  Project	
  Kit!
CoolJunk	
   is	
   India's	
   fastest	
...
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Physics Investigatory Project on LDR as Variable Resistor

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Physics Investigatory Project on LDR as Variable Resistor

  1. 1. Part of Made in India, Design Innovation Workshop,2015 A  Fresh  New  Experience  in   Project-­‐Making  &  Learning!
  2. 2. PHYSICSINVESTIGATORY PROJECTON LDRASVARIABLERESISTOR
  3. 3. Have  you  seen  the  Volkswagen’s  talking  newspaper   ad?    An  LDR  (light  dependant  resistor)  was  embedded   in  the  newspaper  such  that  the  moment  a  person   opened  the  newspaper,  light  fell  on  the  LDR  and  the   audio  circuit  became  acMve,  producing  a  pre-­‐recorded   sound. In  this  project,  you  will  need  a  breadboard,  an  LED,  a   resistor,  an  LDR,  a  mulMmeter  and  a  few  connecMng   wires.  A  mulMmeter  is  connected  in  series  with  the   circuit.  When  the  light  is  switched  off,  the  current  in   the  circuit  and  the  resistance  across  the  LDR  were   measured  through  the  mulMmeter.  The  value  of   current  was  also  calculated  theoreMcally  using  Ohm’s   law  and  KVL  (Kirchhoff’s  Voltage  Law).  Both  values   were  found  to  be  approximately  the  same. Then  the  same  circuit  was  observed  in  light,  and   likewise  the  current  and  resistance  were  measured.  In   this  case  also,  both  the  theoreMcal  and  mulMmeter   values  of  current  were  found  to  be  approximately  the   same.  However,  it  was  observed  that  the  resistance   offered  by  the  LDR  in  the  dark  was  much  higher  than   its  resistance  in  the  light  and  consequently  the  LED   glows  brighter  in  the  light  than  in  the  dark. In  the  end,  the  mulMmeter  was  removed  and  the  LDR   and  resistor  were  connected  in  series.  It  was   observed  that  the  intensity  with  which  the  LED  glows   decreases  when  the  top  surface  of  LDR  was  covered   with  a  finger.  The  intensity  of  glow  increased  when   the  finger  is  removed.  Thus  the  LDR  acts  as  a  variable   resistor  whose  resistance  decreases  in  the  light  and   increases  in  the  dark.
  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,  innovaMon  and  high  producMon  value.  CoolJunk  has  been   featured   in   naMonal   and   internaMonal   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:  LDR For  more  projects  visit  our  website:  CoolJunk   All  tools  and  components   in  one  box. Step  by  step  visual   instrucMons Detailed  experiment   theory CoolJunkCoolJunkCoolJunk Follow  us  on: CoolJunk

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