00:01
We have a current flowing and we're told this current, i'm using the simple i for current, is 3 .2 microampiers.
00:14
And so to go from microampiers to just ampiers or amps, you are going to multiply by 1 times 10 to the negative 6.
00:24
That's the conversion for micro.
00:26
So it's really just 3 .2 times 10 to the negative 6 amps.
00:31
And we're told we have 20 ,000 electrons moving through, and we want to know about how long that takes.
00:47
Well, the equation for current is equals i equals to charge divided by time.
00:55
But we don't know the charge, but we can find charge from the equation q equals n.
01:01
So we're going to put that in here, but we're going to leave it as scale.
01:06
Because this is a scalar quantity, even though we know electrons have a negative charge.
01:10
The charge will be negative.
01:15
All right.
01:16
And so this is how we would use our equation.
01:20
But we're looking for time...