- #1

mr_coffee

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A series RLC circuit is driven by an alternating source at a frequency of 380 Hz and an emf amplitude of 90.0 V. The resistance is 20.0 , the capacitance is 12.1 µF, and the inductance is 24.2 mH.

What is the rms potential difference across the resistor?

my first answer was wrong,

Am i t hinking this right?

Vab = Vmax sin(wt)

Vab = iR

i = 90/20 = 4.5, but thisn't isn't i max is it?

do i have to take i/sqrt(2) to get i max?

then with i max can i find the rms across the ressitor?

I found a formula that syas:

Vab = Vmax*sin(wt) but time isn't given at all, netiehr isVmax!