00:03
Hello, so here the formula we have to use.
00:05
It's going to be v equals v0, 1 minus e, 50 over rc.
00:27
So we're going to ask to find time.
00:31
Let's go back to the question.
00:34
So v0 is going to be 15 and v is 10.
00:44
That's the final voltage.
00:46
This is the initial, which is 15, 1 minus e, then the initial.
00:52
Negative t over resistance is 800.
00:56
I'll double check that, yeah.
00:59
800 times c.
01:06
So we can have 10 over 15 equals 1 minus e to the negative t over 80 c.
01:18
So e to the negative t over 800 c equals 1 minus 10 over 15.
01:30
So let's see what that is.
01:38
So that's going to be 1 over 3.
01:43
So we can use lim here.
01:55
So len e to the negative t let's c equals len of 1 of 3.
02:08
So this will become, so you know, lots of logarithms, right? this is going to come here and multiply...