00:01
Here we have this rlc circuit.
00:04
We're given resistance, inductance, and capacitance.
00:09
We're also given the voltage as a function of time.
00:13
Our angular frequency is 280 radiance per second.
00:20
So first of all, we have to calculate the inductive and capacitive reactances.
00:28
So xl is omega l, and xc is 1 over omega c, which is 600.
00:35
149 oms, omega -l was 120 oms.
00:43
And then impedance, square root of r squared plus xl minus xc quantity squared.
00:51
It comes out to be 573 oms.
00:55
That's part a.
01:04
In part b, the maximum current is the maximum voltage divided by z.
01:14
It comes out to be 4 .71 times 10 of the minus 2 ampires.
01:18
The phase angle.
01:24
So most of the time you look in textbooks or wherever, they're going to tell you the phase angle of the current relative to the voltage.
01:32
They actually ask us for the reverse.
01:35
So it's the arc tangent of xc minus xl over r, instead of xl minus xc, which is what most books quote...