00:01
Hi guys, now in this problem we are given to us the circuit.
00:03
The value of r1 and r2 is given to us.
00:05
R1 is what? this is 15 oom and r2 is what? r2 is equal to this is 5 .5 om.
00:16
If you see very carefully, these register are connected in a parallel form, these registers.
00:25
These all registers are connected in a parallel form.
00:29
And these two registers are connected in a series form.
00:32
These two registers so let me redraw the structure this is like this this is r1 this is r2 and this is r2 plus 20 okay this is r2 plus 20 which will what if you add this number r2 plus 20 this is what 25 .5 r2 we have what 5 .5 r1 we have 15 and this is r1 again have 15 and this is but 25 now see very carefully these registers are connected in a parallel form these three registers so if i redraw this structure and find out the value of this thing this will be what this can be written is what redraw this structure i'm going to read draw the other structure this is a register with 15 om and this is a final register now this register, this 15 om is connected with a parallel to 15 om and this parallel to connected with what? this is 25 .5 om.
01:59
So when three registers are connected in a parallel form, so we can say that r equivalent is equal to what? 1 divided by r1 plus 1 divided by r2 plus 1 divide by r3.
02:13
So this comes out to what this will is equal to 3 .47.
02:21
So this is 3 .47, this is 15, this is 25, and this is a point what? this is a point b and this is a point a.
02:32
Let me write this is a point.
02:34
This point is a.
02:38
So in order to find out v of ab, we just need to find out the potential difference across this register 3 .47.
02:47
So r equivalent of the circuit is equal to what? 15 plus 3 .47 and this will be comes out to about 18 .47 oom so current in the circuit is equal to what i is equal to v divide by our equivalent which is what 25 divide by 18 .47 and this comes out to what this is this is equal to what 1 .35 ampere so the potential difference across this point a and b will be what just potential difference across the register 3...