00:01
Okay, so we're doing chapter 26, problem 33.
00:03
So we have this circuit shown here, and it says, determine the magnitudes and directions of the currents through r1 and r2.
00:12
Okay, so we know there's no resistors in the bottom branch, so we can write kierkov's loop equations that only have one current here, which is easy enough.
00:23
So if we draw, i'm going to write this in blue here, so let's draw this big outer current loop here.
00:31
How we can write this equation, which i'll write in blue to signify that loop, is we have v3, and going counterclockwise, we see that there is an i -1 times r -1, and now we add on v1, and we know that this is equal to 0.
00:52
Okay, so here is one equation, and we can just solve from what i is here.
00:58
So i1 now becomes v1 plus v3 all over r1.
01:05
So this is 15 volts over 22 oms for 0 .68 amps...