# AC Using KVL for RL

Discussion in 'Homework Help' started by davonecuts, Sep 5, 2009.

1. ### davonecuts Thread Starter New Member

Sep 5, 2009
2
0
I have been working on this for 2 days Ive tried to do it in polar form and rectangular The loop equation is VmCos(wt-0)=RImSin(wt)+wLImCos(wt)
When i add them up of course the equal Vm but the problem ask to sovle for VLmax and Vrmax I can use Vin VR + VL but how do u do it with The first loop I presented the givens are R 1000 ohms F=2000hz Vmax =10v L=100mH
So far i think its Vm/IM=RI+wl
Vrmax6.2v Vlmax 7.8v Imax 6.2ma

2. ### Ratch New Member

Mar 20, 2007
1,068
4
davonecuts,

Looks to me like you got the right answers. What is the problem?

ω=2∏f = 12566, Xl = jωL = j1257, Z = 1000 + j1257 = 1606/_51.5 , Im = 10/(1606/_51.5) =0.00623/_-51.5 , Vrmax = 1000*Im = 6.23/_-51.5 volts, Vlmax = j1257*Im = 7.83/_38.5 .

Ratch

3. ### davonecuts Thread Starter New Member

Sep 5, 2009
2
0
The answers didnt add up to multisim values because they were in RMS. You could also calculate the values in Polar or Rectangular form but they wont work with out a degree or imaginary number.The question wanted the answers with out the phase diff so you would just use Sqrt of x ^2 + y^2 . Duhhh