00:01
This problem is a matter of simplifying a circuit that has some parallel branches and some series resistors.
00:08
And so we'll keep in mind that for a parallel circuit, that the total resistance is the reciprocal of the sum of the reciprocals.
00:21
So, starting over on the right -hand side, there's a 2 -kil -oam and 2 -kil -oam there in series.
00:27
And so you have essentially you have four kilo -ooms, and you have those two put together are four kilo -ooms.
00:38
And so the resistance at that stage is one over, one over four, plus one over four.
00:45
And so that equals to two kilo -ooms.
00:50
So then you put that in with the previous branch.
00:53
So you have two kilo -ooms up top.
00:58
And now you have 2 kilo -ooms here, and then there you have 12.
01:09
So these, of course, combined to become 4...