7.1 ? 3.0 ? 7.1 ? 4.1 ? 1.4 ? 11.0 ? 9.00 V 3.0 ? Find the...

Transcript

00:01 This problem consider the circuit in the picture find the current in the 1 .4 ohm resistor alright so now what we would do is first of all we will understand how this current is going through like in the circuit so here is the current let us say this is i okay moving from here okay moving from here it is going here now this is bifurcated in two parts which is i1 and let us assume here this is i2 so we know in like here it is again bifurcated so that means let us say here i3 and i4 i'm just telling about that but after that when it when it adds again so it is again i1 i1 is equals to i3 plus i2 correct similarly for here also if you see here it will be like let us make it like this and this is one row okay so here also the same thing occurs but still when you add it this will be the same flowing through this so after moving after this branch this current will be similar to i2 itself alright so now we will calculate for that let us just do so basically we need to find i2 itself okay so now we will find from here we will try to do so so here these two as you can see in this problem here in this diagram this is 7 .1 so how you can solve the equivalent resistance which is in parallel combination right so here the value of resistance is same so that means it will be 7 .1 by 2 correct because two resistors are there here okay so 7 this means the equivalent resistance will be what we will write here this will be let me write with the blue pen here alright so it will be 7 .1 by 2 which is equals to 3 .55 correct i will also tell you the another method for another branch right so that you can understand the two methods for solving the resistance equivalent resistance which are in parallel combination so now this is 3 .55 ohm again this is 3 .0 so in all total when you like find the equivalent combination so here it will be one combination which is equals to 3 .55 plus 3 .0 which is equals to 6 .55 ohm so in all together the for this branch we have 6 .55 ohms correct now let us just look forward with the branch in which we need to find the current i2 correct so now here 4 .1 is there and 11 .0 is in parallel combination what does it mean it means that there will be the equivalent resistance will be what equivalent resistance for this parallel combination will be 1 by r eq correct so now it will be r1 and let us say r1 and r2 are there in parallel combination which means that this is nothing but r eq will be equals to r1 r2 by r1 plus r2 this is what we have to do here so now here let us suppose r1 is 4 .1 r2 is 11 .0 so now it becomes r equivalent for this one would be this combination of parallel combination would be 4 .1 multiplied by 11 .0 whole divided by 4 .1 plus 11 .0 let us just find out that so here it will be 4 .1 multiplied by 11 .0 right so this is whole divided by 15 .1 correct so it becomes two points it will be nothing but it will be 2 .986 ohms so this is the value for this resistor now so remember one more thing is there correct so here i is flowing correct after here being here this is also i itself okay so here there is no division of current okay so 3 .0 could not be taken as in parallel with these three okay so this is very important point here…

Question

7.1 ? 3.0 ? 7.1 ? 4.1 ? 1.4 ? 11.0 ? 9.00 V 3.0 ? Find the current in the 1.4 ? resistor.

Question

7.1 ? 3.0 ? 7.1 ? 4.1 ? 1.4 ? 11.0 ? 9.00 V 3.0 ? Find the current in the 1.4 ? resistor.

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