00:01
In this problem we have a circuit that looks somewhat like this, a switch here, we have a battery here, we have a capacitor here, here and here, and we have two resistors here.
00:23
And we are asked to draw one, an equivalent circuit with all the capacitors and resistors combined.
00:33
R1 is 25 oms, r2 is 33 oms, c1 is 46 microferrets c2 is 12 microferrets and c3 is 23 and c3 is 23 micro ferrets c2 and c3 our r parallel so we do 12 plus 23 we get 35 microferds and since c1 and c r series we do the reciprocal 1 over 35 plus 1 over 46 and we get the overall capacitance is 19 .9 microferds.
01:44
The resistors are in series.
01:52
So we just add them together, 25 plus 33 equals 58 oms.
02:02
So our overall down, diagram is going to look like this.
02:34
And our resistance is 58 oms.
02:40
This is a.
02:42
For the next part we have to find out what the charge is after a long time has passed.
02:48
We will use the formula charge equals the capacitance times a change in voltage...