00:01
Okay so we're given this circuit.
00:02
We want to find, first write down the equations and then solve for the current.
00:09
So the junction rule, look at this junction at the top.
00:12
We got i1 going in and i2 and i3 coming out.
00:23
And then we have loops.
00:29
Loop 1.
00:30
So it tells us it's going clockwise around the loop.
00:42
So i always start at the battery so it's minus 4 volts.
00:47
Then we get to the 8 ohm resistor.
00:49
We're going opposite to the current so it gets a plus 8 i2.
00:56
And then we're going with the current here so it gets a minus 6 i3 equals zero.
01:09
And then loop 2.
01:12
We'll start down here below the 4 volt battery.
01:16
So we get plus 4 volts.
01:18
Then we're opposite to i3 so it's plus 6 i3...