00:01
This question we're talking about resistors in parallel.
00:02
So we have a circuit that looks kind of like this.
00:05
We have r1, r2, r3, and we're given for the first part of this question that r1 is equal to 2 .2 oms, r2 is equal to 1 ome, and r3 is equal to 2 oms.
00:21
And we want to know what is the equivalent resistance of this circuit.
00:28
The equivalent resistance formula for a parallel circuit looks like this.
00:31
It's 1 over.
00:32
The equivalent resistance equals 1 over r1 plus 1 over r2 plus 1 over r3.
00:40
So let me just plug in what we know.
00:43
So the 1 over the equivalent resistance equals 1 over 2 .2 plus 1 over 1 plus 1 over 2.
00:52
And so then you end up with the number 1 .954.
01:00
But we want the equivalent resistance.
01:02
So we're going to have to take the inverse of both sides.
01:05
Equivalent resistance is equal to 1 over 1 .954, which is equal to 0 .512 oms.
01:14
And that's our answer for the first part.
01:16
The next part, we're told that the voltage, it's like a new separate thing, we're told that the voltage in a parallel circuit is 5 volts.
01:29
And we're also told that r1 equals 4 .7 oms, r2 equals 1 .8 oms, and r3 also equals 1 .8 oms...