00:01
Okay, so i have this configuration.
00:04
I have to find or i want to find what the three currents are.
00:09
I already painted the three of them and so we are going to use this and these two rules one or the first says that the sum of all the potential differences in a closed loop must be equal to zero and the other states that the some of the currents that come in must be the same as the some currents that go out.
00:38
So it's kind of like energy conservation thing.
00:46
Okay, so the first one actually gives us an equation, i mean the second one gives us an equation that we are going to use.
00:56
Because if you see the diagram, you see that the first current comes through this point, and divides into the other ones, i -1 and i -2, i -2 and i -3.
01:11
And this point, i -2 and i -3 add each other up to make i -1.
01:17
Okay, so this is actually saying that i -1 must be equal to the sum of i -2 plus i -3.
01:25
So this is a thing that makes physical sense.
01:30
Okay...