Complete IIT AIEEE ICSE ISC PMT help forum
This is a free help Forum for Indian Students.
Complete IIT AIEEE ICSE ISC PMT help forum

Complete help forum for students preparing for icse iit aieee cbse pmt and other related exams.Stay updated about all 2011 exams.
 
HomeHome  PortalPortal  FAQFAQ  SearchSearch  RegisterRegister  MemberlistMemberlist  UsergroupsUsergroups  Log in  India NewsIndia News  
Keywords
Latest topics
Top posters
abhas
 
Anu..i luv icse...:)
 
G-7
 
siya
 
Candy
 
jOhNy
 
Apurva
 
WinRrule
 
ambili
 
saif
 



Search if you can't find it here

help

View previous topic View next topic Go down
Go to page : Previous  1, 2
AuthorMessage
Hari
Active member
Active member
avatar


PostSubject: Re: help Wed Feb 18, 2009 2:44 pm

All are welcome Smile
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Sun Feb 22, 2009 6:22 pm

resistance depends upon temp of conductor => varies with temp as in the case of a glowing bulb and a bulb wich is switched off.
H is directlt proportional to current sq
higher the current, higher the temp-- diffficult to kp ratio v/i constant
Back to top Go down
View user profile
jOhNy
Active member
Active member
avatar


PostSubject: Re: help Sun Feb 22, 2009 7:56 pm

hey wait...internal resistance i directly prop to the surface area n inversely prop to the temp of the electrolytic cell.
Back to top Go down
View user profile
Anu..i luv icse...:)
Active member
Active member
avatar


PostSubject: Re: help Sun Feb 22, 2009 9:19 pm

yes..john is right...

now one more..resistance is in syll, but resistivity is not there right?
Back to top Go down
View user profile
vaish93
Active member
Active member
avatar


PostSubject: Re: help Sun Feb 22, 2009 10:29 pm

ppl,
Concise says-The internal resistance of a cell is:
a) Inversely prop to the surface area of the electrodes
b)directly prop to the distance b/w the electrodes
c)directly prop to the concentration of the electrolyte, and
d)inversely prop to the temperature of the electrolyte.

Now,is this right or wrong????!!!!!!!!!!!!!!
Back to top Go down
View user profile
siya
Active member
Active member
avatar


PostSubject: Re: help Sun Feb 22, 2009 10:30 pm

hey!!i think even resistvity is dere..
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Mon Feb 23, 2009 8:21 pm

Yes,it is there
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Mon Feb 23, 2009 8:25 pm

vaish, whtz given in the concise is correct.

internal resistance is inversely proportional to surface area of electrodes, as larger surface area means more ions available to flow, means more current => less resistance
Back to top Go down
View user profile
Anu..i luv icse...:)
Active member
Active member
avatar


PostSubject: Re: help Mon Feb 23, 2009 8:30 pm

my sir has not taught about resistivity...he has taught only resistance.....i checked the syll, its not there..

by the way..what is resistivity...i hope u guys know that resistance n resististivity are different
Back to top Go down
View user profile
siya
Active member
Active member
avatar


PostSubject: Re: help Mon Feb 23, 2009 8:43 pm

hey!!ya anu....we know d diff. very well dear....n m sure dat it is dere...
Back to top Go down
View user profile
ambili
Active member
Active member
avatar


PostSubject: Re: help Mon Feb 23, 2009 9:12 pm

resistivity is a very small topic n very easy,just have a look
Back to top Go down
View user profile
Anu..i luv icse...:)
Active member
Active member
avatar


PostSubject: Re: help Tue Feb 24, 2009 1:24 am

k...thnx..
Back to top Go down
View user profile
vaish93
Active member
Active member
avatar


PostSubject: Re: help Tue Feb 24, 2009 10:13 pm

To Quest...
yeah...tht i understand...but the problem is over temperature and concentration of ions....
goyal tells it differently frm concise!!
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:00 pm

TO VAISH,
Since the chemical reactions run faster at higher temperatures, and the ions move faster at higher temperatures, a higher temperature also increases the reaction speed and thus lowers the internal resistance of the battery.
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:09 pm

ALSO higher the concentration of electrolyte , more recombination of ions takes place, hence larger the internal resistance.
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:10 pm

RESISTANCE OF METALLIC CONDUCTORS IS DIRECTLY PROPRTIONAL TO TEMPERATURE
BUT IT REVERSE FOR ELECTROLYTES-- INTERNAL RESISTANCE IS INVERSELY PROPORTIONAL TO TEMP.
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:12 pm

To Anu,
resistivity is mentioned in syllabus as RESISTANCE AS THE PROPERTY OF MATERIAL USED.
Back to top Go down
View user profile
jOhNy
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:15 pm

arre resistivity is the resistance of a material of unit length n unit area of cross section..
Back to top Go down
View user profile
QUEST
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:19 pm

THANKS ,I KNO, SOMEONE WAS TELLING ITS NT IN SYLLABUS
Back to top Go down
View user profile
jOhNy
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 8:19 pm

concise is not exactly correct..
int res is directly prop to the surface area...since more ions are produced..more collisions on the way to the opp electrode with the other ions..thus mor res..
Back to top Go down
View user profile
Anu..i luv icse...:)
Active member
Active member
avatar


PostSubject: Re: help Fri Feb 27, 2009 9:49 pm

k..i will take a look at it QUEST...thank you...
Back to top Go down
View user profile
Sponsored content




PostSubject: Re: help

Back to top Go down

help

View previous topic View next topic Back to top
Page 2 of 2Go to page : Previous  1, 2

Permissions in this forum:You cannot reply to topics in this forum
Complete IIT AIEEE ICSE ISC PMT help forum :: Physics :: Physics help forum-