Sirsh
- 262
- 10
Hey guys, Just need some help with this question, It asks for the answers to be in circuit parameters:
http://tinypic.com/r/k0k2ed/5
For some reason I don't think my answers are correct as I'm finding it hard to make sense of my answers to the questions.
a)Find the voltage Vab (magnitude and angle)
Vab = Va-Vb
current going to the first two resistors: I1=(V\angle0)/(2R)
current going through resistor and inductor: I2 = (V\angle0)/(R+Xl\angle90)
Itotal = I1+I2 = (V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90)
Va=It*2R = (V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90)*2R = (V\angle0(3R+Xl\angle90))/(R+2RXl\angle90)
Vb = It*(R+Xl\angle90) = (V\angle0(3R+Xl\angle90))/(3R+RXl\angle90)
Vab = Va-Vb
Therefore: (V\angle0(3R+Xl\angle90))/(R+2RXl\angle90) - (V\angle0(3R+Xl\angle90))/(3R+RXl\angle90).
Not sure if that's right.. A little insight would be appreciated!
b) Calculate the active power dissipated in each reistance.
Power dissipated in resitor/s (R) = I^2*R = ((V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90))^2*R
Power dissipated in inductor = 0.
c) Calculate the reactive power dissipated in Xl.
Q = I^2*jXl = I^2*Xl\angle90 = ((V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90))^2*Xl\angle90
d) calculate the total current
Now this is where I am confused it asks me to calculate the total current now even though i thought I already have.. Is this wrong?
Thanks a lot guys.
http://tinypic.com/r/k0k2ed/5
For some reason I don't think my answers are correct as I'm finding it hard to make sense of my answers to the questions.
a)Find the voltage Vab (magnitude and angle)
Vab = Va-Vb
current going to the first two resistors: I1=(V\angle0)/(2R)
current going through resistor and inductor: I2 = (V\angle0)/(R+Xl\angle90)
Itotal = I1+I2 = (V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90)
Va=It*2R = (V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90)*2R = (V\angle0(3R+Xl\angle90))/(R+2RXl\angle90)
Vb = It*(R+Xl\angle90) = (V\angle0(3R+Xl\angle90))/(3R+RXl\angle90)
Vab = Va-Vb
Therefore: (V\angle0(3R+Xl\angle90))/(R+2RXl\angle90) - (V\angle0(3R+Xl\angle90))/(3R+RXl\angle90).
Not sure if that's right.. A little insight would be appreciated!
b) Calculate the active power dissipated in each reistance.
Power dissipated in resitor/s (R) = I^2*R = ((V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90))^2*R
Power dissipated in inductor = 0.
c) Calculate the reactive power dissipated in Xl.
Q = I^2*jXl = I^2*Xl\angle90 = ((V\angle0(3R+Xl\angle90))/(3R+2RXl\angle90))^2*Xl\angle90
d) calculate the total current
Now this is where I am confused it asks me to calculate the total current now even though i thought I already have.. Is this wrong?
Thanks a lot guys.