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RReessiissttaannccee aanndd OOhhmm’’ss 
LLaaww 
NNoovveemmbbeerr 77,, 22001144
OObbjjeeccttiivveess 
11.. DDeessccrriibbee tthhee ppaarrttss ooff OOhhmm’’ss LLaaww 
- VVoollttss,, aammppss,, aanndd rreessiissttaannccee 
11.. GGiivveenn ttwwoo kknnoowwnn vvaalluueess,, ccaallccuullaattee 
tthhee uunnkknnoowwnn uussiinngg OOhhmm’’ss LLaaww
SSiimmppllee CCiirrccuuiittss 
 WWiirree,, VVoollttaaggee SSoouurrccee,, sswwiittcchh,, aanndd aa 
DDeevviiccee
EElleeccttrriiccaall RReessiissttaannccee 
 RReessiissttaannccee ooff 
eelleeccttrroonnss ttoo ffllooww 
iinn aa cciirrccuuiitt 
 WWhhaatt aaffffeeccttss 
rreessiissttaannccee?? 
• LLeennggtthh,, aanndd wwiiddtthh 
aanndd ttyyppee ooff wwiirree
 SShhoowwnn bbyy aa zziigg--zzaagg 
ssyymmbbooll iinn aa cciirrccuuiitt 
 CCoonnttrroollss ccuurrrreenntt 
 MMeeaassuurreedd iinn oohhmmss
OOhhmm’’ss LLaaww 
 RReellaattiioonnsshhiipp bbeettwweeeenn ccuurrrreenntt,, 
rreessiissttaannccee,, aanndd vvoollttaaggee
OOhhmm’’ss LLaaww 
 VV==IIRR 
 CCuurrrreenntt iiss pprrooppoorrttiioonnaall ttoo tthhee vvoollttaaggee 
aanndd iinnvveerrssee ttoo tthhee rreessiissttaannccee 
 VVoollttaaggee((VV))==CCuurrrreenntt ((II))**RReessttiissttaannccee((RR)) 
 UUnniittss:: 
• VVoollttss ((VV)) == AAmmppss ((AA))**OOhhmm’’ss ((ΩΩ))
 1 volt across a circuit wwiitthh aa rreessiissttaannccee ooff 
11 oohhmm pprroodduucceess aa ccuurrrreenntt ooff 11 aammppeerree 
 WWhhaatt iiss tthhee ccuurrrreenntt iiff tthheerree aarree 1122 vvoollttss 
aaccrroossss tthhee ssaammee cciirrccuuiitt?? 
 WWhhaatt aabboouutt IIff tthhee rreessiissttaannccee iinnccrreeaasseedd ttoo 
ttwwoo oohhmmss wwiitthh 11 vvoolltt??
 How much current fflloowwss tthhrroouugghh aa 
llaammpp wwiitthh aa rreessiissttaannccee ooff 6600 oohhmmss 
wwhheenn tthhee vvoollttaaggee aaccrroossss tthhee llaammpp iiss 
1122VV?? 
 WWhhaatt iiss tthhee rreessiissttaannccee ooff aann eelleeccttrriicc 
ffrryyiinngg ppaann tthhaatt ddrraawwss aa ccuurrrreenntt ooff 
1122AA wwhheenn ccoonnnneecctteedd ttoo aa 112200--VV 
cciirrccuuiitt??
EElleeccttrriicc SShhoocckk aanndd OOhhmm’’ss 
 RReessuulltt ffrroomm tthhee ccuurrrreenntt tthhrroouugghh tthhee 
bbooddyy 
 DDeeppeennddss oonn vvoollttaaggee aanndd bbooddyy’’ss 
eelleeccttrriiccaall rreessiissttaannccee ((110000 oohhmmss ttoo 
550000,,000000 oohhmmss))
Effect of EElleeccttrriicc CCuurrrreenntt oonn tthhee 
BBooddyy 
CCuurrrreenntt((AA)) EEffffeecctt 
00..000011 CCaann bbee ffeelltt`` 
00..000055 IIss ppaaiinnffuull 
00..001100 CCaauusseess iinnvvoolluunnttaarryy mmuussccllee 
ccoonnttrraaccttiioonnss ((ssppaassmmss)) 
00..001155 CCaauusseess lloossss ooff mmuussccllee ccoonnttrrooll 
00..007700 GGooeess tthhrroouugghh tthhee hheeaarrtt,, sseerriioouuss 
ddaammaaggee,, pprroobbaabbllyy ffaattaall iiff llaassttss 
lloonnggeerr tthhaann 11ss
 To receive aa sshhoocckk tthheerree mmuusstt bbee aa 
ddiiffffeerreennccee iinn vvoollttaaggee (( aa cciirrccuuiitt mmuusstt 
bbee ffoorrmmeedd)) 
 EElleeccttrroonn ffllooww wwiillll ffoollllooww tthhee ppaatthh ooff 
lleeaasstt rreessiissttaannccee
PPlluuggss aanndd ssoocckkeettss 
 WWiirreedd wwiitthh tthhrreeee ccoonnnneeccttiioonnss 
 TTwwoo ffllaatt pprroonnggss aarree ffoorr ccuurrrreenntt-- 
ccaarrrryyiinngg 
 TThhee llaarrggeerr rroouunndd pprroonngg ccoonnnneeccttss ttoo aa 
wwiirree iinn tthhee ggrroouunndd ((ggrroouunnddeedd))
 At 100,000 oohhmmss hhooww mmuucchh ccuurrrreenntt 
wwiillll ffllooww tthhrroouugghh yyoouurr bbooddyy iiff yyoouu 
ttoouucchh tthhee tteerrmmiinnaallss ooff aa 1122--VV 
bbaatttteerryy?? 
 IIff yyoouurr sskkiinn iiss vveerryy mmooiisstt,, ssoo tthhaatt 
yyoouurr rreessiissttaannccee iiss oonnllyy 11000000 oohhmmss,, 
aanndd yyoouu ttoouucchh tthhee tteerrmmiinnaallss ooff aa 1122-- 
VV bbaatttteerryy,, hhooww mmuucchh ccuurrrreenntt ddoo yyoouu 
rreecceeiivvee??

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Ohm's law

  • 1. RReessiissttaannccee aanndd OOhhmm’’ss LLaaww NNoovveemmbbeerr 77,, 22001144
  • 2. OObbjjeeccttiivveess 11.. DDeessccrriibbee tthhee ppaarrttss ooff OOhhmm’’ss LLaaww - VVoollttss,, aammppss,, aanndd rreessiissttaannccee 11.. GGiivveenn ttwwoo kknnoowwnn vvaalluueess,, ccaallccuullaattee tthhee uunnkknnoowwnn uussiinngg OOhhmm’’ss LLaaww
  • 3. SSiimmppllee CCiirrccuuiittss  WWiirree,, VVoollttaaggee SSoouurrccee,, sswwiittcchh,, aanndd aa DDeevviiccee
  • 4. EElleeccttrriiccaall RReessiissttaannccee  RReessiissttaannccee ooff eelleeccttrroonnss ttoo ffllooww iinn aa cciirrccuuiitt  WWhhaatt aaffffeeccttss rreessiissttaannccee?? • LLeennggtthh,, aanndd wwiiddtthh aanndd ttyyppee ooff wwiirree
  • 5.  SShhoowwnn bbyy aa zziigg--zzaagg ssyymmbbooll iinn aa cciirrccuuiitt  CCoonnttrroollss ccuurrrreenntt  MMeeaassuurreedd iinn oohhmmss
  • 6. OOhhmm’’ss LLaaww  RReellaattiioonnsshhiipp bbeettwweeeenn ccuurrrreenntt,, rreessiissttaannccee,, aanndd vvoollttaaggee
  • 7. OOhhmm’’ss LLaaww  VV==IIRR  CCuurrrreenntt iiss pprrooppoorrttiioonnaall ttoo tthhee vvoollttaaggee aanndd iinnvveerrssee ttoo tthhee rreessiissttaannccee  VVoollttaaggee((VV))==CCuurrrreenntt ((II))**RReessttiissttaannccee((RR))  UUnniittss:: • VVoollttss ((VV)) == AAmmppss ((AA))**OOhhmm’’ss ((ΩΩ))
  • 8.  1 volt across a circuit wwiitthh aa rreessiissttaannccee ooff 11 oohhmm pprroodduucceess aa ccuurrrreenntt ooff 11 aammppeerree  WWhhaatt iiss tthhee ccuurrrreenntt iiff tthheerree aarree 1122 vvoollttss aaccrroossss tthhee ssaammee cciirrccuuiitt??  WWhhaatt aabboouutt IIff tthhee rreessiissttaannccee iinnccrreeaasseedd ttoo ttwwoo oohhmmss wwiitthh 11 vvoolltt??
  • 9.  How much current fflloowwss tthhrroouugghh aa llaammpp wwiitthh aa rreessiissttaannccee ooff 6600 oohhmmss wwhheenn tthhee vvoollttaaggee aaccrroossss tthhee llaammpp iiss 1122VV??  WWhhaatt iiss tthhee rreessiissttaannccee ooff aann eelleeccttrriicc ffrryyiinngg ppaann tthhaatt ddrraawwss aa ccuurrrreenntt ooff 1122AA wwhheenn ccoonnnneecctteedd ttoo aa 112200--VV cciirrccuuiitt??
  • 10. EElleeccttrriicc SShhoocckk aanndd OOhhmm’’ss  RReessuulltt ffrroomm tthhee ccuurrrreenntt tthhrroouugghh tthhee bbooddyy  DDeeppeennddss oonn vvoollttaaggee aanndd bbooddyy’’ss eelleeccttrriiccaall rreessiissttaannccee ((110000 oohhmmss ttoo 550000,,000000 oohhmmss))
  • 11. Effect of EElleeccttrriicc CCuurrrreenntt oonn tthhee BBooddyy CCuurrrreenntt((AA)) EEffffeecctt 00..000011 CCaann bbee ffeelltt`` 00..000055 IIss ppaaiinnffuull 00..001100 CCaauusseess iinnvvoolluunnttaarryy mmuussccllee ccoonnttrraaccttiioonnss ((ssppaassmmss)) 00..001155 CCaauusseess lloossss ooff mmuussccllee ccoonnttrrooll 00..007700 GGooeess tthhrroouugghh tthhee hheeaarrtt,, sseerriioouuss ddaammaaggee,, pprroobbaabbllyy ffaattaall iiff llaassttss lloonnggeerr tthhaann 11ss
  • 12.  To receive aa sshhoocckk tthheerree mmuusstt bbee aa ddiiffffeerreennccee iinn vvoollttaaggee (( aa cciirrccuuiitt mmuusstt bbee ffoorrmmeedd))  EElleeccttrroonn ffllooww wwiillll ffoollllooww tthhee ppaatthh ooff lleeaasstt rreessiissttaannccee
  • 13. PPlluuggss aanndd ssoocckkeettss  WWiirreedd wwiitthh tthhrreeee ccoonnnneeccttiioonnss  TTwwoo ffllaatt pprroonnggss aarree ffoorr ccuurrrreenntt-- ccaarrrryyiinngg  TThhee llaarrggeerr rroouunndd pprroonngg ccoonnnneeccttss ttoo aa wwiirree iinn tthhee ggrroouunndd ((ggrroouunnddeedd))
  • 14.  At 100,000 oohhmmss hhooww mmuucchh ccuurrrreenntt wwiillll ffllooww tthhrroouugghh yyoouurr bbooddyy iiff yyoouu ttoouucchh tthhee tteerrmmiinnaallss ooff aa 1122--VV bbaatttteerryy??  IIff yyoouurr sskkiinn iiss vveerryy mmooiisstt,, ssoo tthhaatt yyoouurr rreessiissttaannccee iiss oonnllyy 11000000 oohhmmss,, aanndd yyoouu ttoouucchh tthhee tteerrmmiinnaallss ooff aa 1122-- VV bbaatttteerryy,, hhooww mmuucchh ccuurrrreenntt ddoo yyoouu rreecceeiivvee??