00:02
In part a, we are going to compute the total resistance of these three parallelly connected resistors.
00:11
Since they are in a parallel connection, so their total resistance will be...
00:20
We take the reciprocal of each resistor.
00:28
Take reciprocal, sum them, and then take reciprocal again.
00:32
So it is 100 over 100 plus 10 over 100 plus 1 over 100.
00:42
Take reciprocal, which is 111 over 100.
00:50
Reciprocal, which is 100 divided by 111.
00:56
If we compute it, it will be 0 .900900 ohm.
01:13
But we take three significant figures, so it is 0 .99...
01:19
Oh, i'm sorry, 0 .900 ohm.
01:29
In part b, we first compute the effective resistance of these two parallelly connected resistors.
01:41
So we circle it in red.
01:45
We let its resistance to be r tilde.
01:51
So we have 1 over r tilde equal 1 over 24 plus 1 over 8.
02:09
So it is 1 over 24 plus 3 over 24.
02:15
So it is 4 over 24, which is 1 over 6.
02:21
So it implies r tilde equal 6.
02:27
So the total resistance, let it be r.
02:32
Then we have r equal r tilde plus 4, because they are in series connection.
02:39
So we sum them.
02:40
So it is 6 plus 4, which is equal to 10 ohm.
02:48
In part c, we first compute the resistance of these two parallelly connected resistors.
02:57
Call it r1.
03:01
So r1 equal 1 over 37 plus 1 over 45.
03:09
Take reciprocal...