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Physics Investigatory Project on Charging and Discharging of Capacitor.

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Physics Investigatory Project on Charging and Discharging of Capacitor.

  1. 1. Part of Made in India, Design Innovation Workshop,2015 A  Fresh  New  Experience  in   Project-­‐Making  &  Learning!
  3. 3. Do  you  know  that  a  capacitor  is  so  ubiquitous  that  it   is  rare  that  an  electrical  or  electronic  product  does   not  include  at  least  one  for  some  purpose?  Besides   being  used  as  an  energy  storage  device,  it  is  used  in   filter  circuits,  tuning  circuits  (for  radio,  TV,   transmiMers  etc.)  and  also  as  shock  absorbers  in   voltage  stabilizers.  You  can  learn  about  the   funcRoning  of  a  capacitor  and  how  the  voltage   across  it  changes  when  it  gets  charged. This  project  is  divided  into  two  phases.  In  the  first   phase,  a  resistor,  a  capacitor  and  an  LED  are   connected  in  series  on  the  breadboard.  The   mulRmeter  probes  are  connected  to  the  capacitor   for  a  constant  voltage  measurement  across  its   terminals,  before  supply  is  given  to  the  circuit.   Immediately  aTer  the  supply  is  given,  the  LED  starts   to  glow  with  maximum  intensity  and  the  meter   shows  an  instantaneous  voltage  reading  of  0  V.  The   meter  will  show  a  conRnuously  increasing  voltage   which  becomes  steady  aTer  someRme.  The  LED   slowly  fades  out.   The  iniRal,  transient  and  steady  voltages  were   observed  and  the  same  were  compared  with   theoreRcal  values  of  voltages  using  the  Rme   constant  (t  =RC)  calculaRons.  It  was  noted  that  the   voltage  across  the  capacitor  at  any  given  Rme  is   equal  to  the  sum  of  iniRal  voltage  and  63%  of  the   difference  between  the  baMery  voltage  and  the   iniRal  voltage  on  the  capacitor.  When  the  voltage-­‐ Rme  graph  of  a  charging  capacitor  was  ploMed,  it   showed  that  the  voltage  in  the  capacitor  increases   exponenRally  and  then  becomes  constant.
  4. 4. In  the  second  phase,  the  baMery  was  removed   and  the  same  charged  capacitor  was   connected  in  parallel  to  the  series  combinaRon   of  another  LED  and  a  resistor.  It  was  found  that   the  LED  glows  for  a  moment  with  a  maximum   voltage  across  the  capacitor.  Similarly  as   above,  the  voltages  on  the  capacitor  in   different  states  were  compared  with  the   theoreRcal  voltages  calculated  using  the  Rme   constant.  Note  that  in  this  case,  the  Rme   constant  is  the  Rme  the  capacitor  takes  to   discharge  37%  of  voltage  on  its  plates.  When   the  voltage-­‐Rme  graph  of  the  discharging   capacitor  was  ploMed,  it  showed  that  the   capacitor  loses  its  voltage  exponenRally  and   the  voltage  becomes  constant  aTer  some  Rme.
  5. 5. 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,  innovaRon  and  high  producRon  value.  CoolJunk  has  been   featured   in   naRonal   and   internaRonal   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:   Charging  &  Discharging  a  Capacitor   CreaAng  spark  using  a  Capacitor For  more  projects  visit  our  website:  CoolJunk   All  tools  and  components   in  one  box. Step  by  step  visual   instrucRons Detailed  experiment   theory CoolJunkCoolJunkCoolJunk Follow  us  on: CoolJunk