IIT JEE , AIEEE Forum - Physics , Mechanics

varun.tinkle

COULD U GIVE ME SOME TRICKS ON HOW TO REDRAW CIRCUITS FOR FINDING EQUIVALENT CAPACITANCE OR RESISTANCE

RATES ASSURED FOR EVERY USEFUL ANSWER

risin

For complicated circuits write A,B,C..at junctions and solve.

varun.tinkle

pls expln in detail

ramyani

Q. All have a capacitance of 1 micro farad. Find C_eq across AB.

ramyani

Let the pot of A be V₁ and the pot of B be V₄ ( if we go on naming 1, 2 etc we reach 4).

3 capacitors have P.D V₁ - V₂ . So they r in || and eq is 3C

2 capacitors have P.D V₂ - V₃ . So they r in || and eq is2C

1 capacitor have P.D V₃ - V₄ .

As we hav to find the eq cap btw A and B , across which the PD is V₁ -V₄ , the 2 cap of eq cap ( 2C ) is out of circuit.

So 3C and 1C is in series and result is 3C / 4.

Finally we put C = 1 micro F

ramyani

The diagram wil be A goes to 3C ( pd V1 - V2 ) and 2C ( pd V2 -V3 ) in series and frm a point between them comes out 1C ( pd V2 - V 4 ) which ends in B.

( thankful to karthik for dia )

http://www.goiit.com/posts/list/electricity-solve-51815.htm#259734

risin

See,

what i meant was suppose you write the alphabets or numbers at eah junction it will be easy to find points at same potential or potential difference.

amarswamy

well my friend it is of course very intricate job but can be made quiet easy

first look out for the juntions and then for the terminals across which the effective R or C is to be calculated.

once u have done with it go for a check whether it is a wheatstone network or not. If it is a wheat stone network your half work is done.

then go for series and parallel connections

u may make ur circuit still simpler by using star -delta conversions.

using KVL and KCl may sometimes help.

rate if it was helpful

Ask & Discuss Questions with Community & Experts