00:01
This question we're going to be using two different laws, kirchhoff's law and oms law.
00:06
So in the beginning, we can use omslaw to find the current.
00:11
So we have i2, the current, because we're going to find it through r2, our second resistor, is equal to vb over r2.
00:24
And this is equal to 12 over 4.
00:30
So we have 3 and our unit is ampere for current.
00:37
So the current for our second object is going to be 3 ampiers.
00:45
Now the next step is to find it for the third object.
00:51
So i3 is going to be equal to i1 plus i2.
00:58
So we also need to find i1.
01:01
So we also know that i1 plus 3 ampiers because we're plugging in our i2 is going to be equal to i3.
01:16
Now we can't really do that much right now, but we could use omslaw to find the voltage drop.
01:25
So we find v1 is equal to r1 times i1.
01:34
And we know v3 is equal to r3 times i3 .3.
01:44
All right, so now this is where we use kirchkoff's law.
01:47
So, kirkov's law states that va is equal to v1 plus v3.
01:57
And we can go ahead and substitute what we have for v1...