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Electricity

Blazing goIITian

Joined:	21 Dec 2007
Post:	1025

15 Jun 2008 09:09:21 IST

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612

series or parallel

None

is there any way to find whether a given set of capacitors or resistance are in series or paralle????????

and in many examples they arrange the given circuit

how to do that???????

explain plzzzzz rtates assured

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Comments (7)

BALGANESH

Blazing goIITian

Joined: 21 Dec 2007

Posts: 1025

15 Jun 2008 09:48:23 IST

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plzzzzzzz
someone explain it

shikhar jain

Cool goIITian

Joined: 3 May 2008

Posts: 98

15 Jun 2008 13:34:57 IST

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if capacitors are in parallel than

potential difference across them would be same

(if a plate of capacitor is connected by wire to another capacitors plate than both will have same potential)

it is not a necessary condition for charge tobe same in both capacitor

if capacitors in series than

important condition that charge will be same on them .

and the potential difference would not be same.

for example

a capacitor c and C here connected in series bcoz potential diff. across c will be V2-V and across C V2-V1(assuming V>V2>V1)

V----------II------V2----II-----------V1

a capacitor c and C connected in parallel

V----------------II-----------------V1

V---------------II-----------------V1

they in parallel bcoz potential is same

but here charge may or may not be same................................................................................................

if understood thank OK

otherwise send me your email id

Tarin Bansal

Blazing goIITian

Joined: 27 Jul 2007

Posts: 3134

15 Jun 2008 13:57:17 IST

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Check this out-

http://www.goiit.com/posts/list/0/community-shelf-circuit-solving-was-never-so-easy-67415.htm#332300

I have shown there how to rearrange circuits.

C!-!!NMAY

Blazing goIITian

Joined: 30 Mar 2008

Posts: 1415

15 Jun 2008 14:46:53 IST

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well i m telling u series combination of cpacitors first.....

Inseries combination of capacitors no. of capacitors r connected in such a way tat the negative plate of one capacitor is connected with the positive plate of other,,,and after connecting no. of capacitors in this way the first and last plate of whole combination is connected with positive and negative terminal of battery.Clearly in series combination charge across each capacitor remain same ,but potential divides ,,,,

suppose there r three capacitors r in series,,,,so total potential...

V=V1+V2+V3

so Q/C = Q/C1+Q/C2+Q/C3...................(q=cv)

so u will get ,,,,1/C = 1/C1+1/C2+1/C3......C is equivalent capacity across two ends,,,

,,,,

NOTE..... if there r n capacitors in series so equivalent capacity is C/n

in series combination Q1=Q2

so C1V1 = C2V2...

SO V proportional to1/C...this implies tat in series potential divides in opposite ratio of capacity....so more is capacity less is the potential,,,and vice-versa,,,

C!-!!NMAY

Blazing goIITian

Joined: 30 Mar 2008

Posts: 1415

15 Jun 2008 14:53:21 IST

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and in series combination potential across individual capacitor,,,,
suppose there r two capacitor connected in series,,,,,of capacity C each,,,so equivalent capacity is ..C/2
and let potential across first capacitor is V! and across other is V2 then
V1 = VC2/C1+C2.....V is total potential,,,
and
V2 =VC1/C1+C2,,,,,,

C!-!!NMAY

Blazing goIITian

Joined: 30 Mar 2008

Posts: 1415

15 Jun 2008 15:01:15 IST

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now i m explaining parallel combination of capacitor,,,,
in parallel combination ,,,the positive plates of all capacitors are connected at one point and negative plates of all capacitors are connected at other point...and these points are connected to the positive and negative terminals of battery....
In parallel combination potential difference across each capacitor remain same and charge distributes ...and total charge is
Q = Q1+Q2+Q3......(for three capacitors )
so CV = C1V+C2V+C3V
SO V = V1+V2+V3,,,,
if n similar capacitor r in parallel then equivalent capacity is
Cp = nC
in parallel combination Q1/Q2=C1/C2
so in parallel combination charge divides in the ratio of capacity,,,,,
parallel combination is used to obtain more capacity at normal voltage,,,,,

AyuSH jaiN ##

Cool goIITian

Joined: 30 Dec 2007

Posts: 31

4 Jul 2008 21:53:39 IST

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in the sreies combination there would be charge same and in parallel combination there would be pottential same for finding itt take a look of circuit and watch the path where the the charge was going straight to another capacitor from one to another staright then the charge is same then the connection is same and if the charge from one capacitor goes in 2 different path and distributed among them at tham time capacitors are in parallel and there pottential difference is same
rate me if i m correct

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