Electrical Engineering - Circuit Theorems in AC Analysis - Discussion
Discussion Forum : Circuit Theorems in AC Analysis - General Questions (Q.No. 1)
1.
Determine VTH when R1 is 180 
and XL is 90 .
and XL is 90 .
135
63.4° V
63.4° V13.563.4° V
63.4° V12.20° V
0° V1220° V
0° VDiscussion:
16 comments Page 1 of 2.
Jai said:
1 decade ago
voltage across A-B = Voltage across XL = Vth.
By volt div. rule,
Vth = (30*j90)/(180+j90).
= 13.5 ang(63.4).
By volt div. rule,
Vth = (30*j90)/(180+j90).
= 13.5 ang(63.4).
(5)
DHANANJAY said:
1 decade ago
This can be solved simply.
First find total impedance "Z" then current in the branch.
Then multiply with the inductor reactance that is X.
z = sqrt of (R^2 + X^2) where R = resistance = 180 and X = reactant = 90.
Solve it.
Find i = supply voltage/impedance (Z) = 30/calculated z.
Now to get Vth multiply calculated current with reactance (x=90).
Then to find phase angle we know that tan Q = x/r.
First find total impedance "Z" then current in the branch.
Then multiply with the inductor reactance that is X.
z = sqrt of (R^2 + X^2) where R = resistance = 180 and X = reactant = 90.
Solve it.
Find i = supply voltage/impedance (Z) = 30/calculated z.
Now to get Vth multiply calculated current with reactance (x=90).
Then to find phase angle we know that tan Q = x/r.
(2)
RAVINDER said:
9 years ago
By using volt division rule Vab = Vs * XL/ (R1 + XL) which give Vab = 10V.
(2)
Bruce said:
9 years ago
In a 3 phase cct, 380v, 1 breaker per phase. Q: when all breakers powered, they all trip, why?
(2)
Nikhil Jain said:
1 decade ago
Can't be (A) , load voltage is higher than the source.
Can't be (C) or (D) , as the phase angle is zero.
Even without doing the calculations, it has to be (B).
Can't be (C) or (D) , as the phase angle is zero.
Even without doing the calculations, it has to be (B).
(1)
Riya said:
6 years ago
Actually, l is inductance but xl is the impedance of that device. Impedance is simply resistance. Hence it is in ohms.
(1)
Anand m said:
1 decade ago
I want no the explanation for this quation.
Alfredo said:
1 decade ago
Why is XL given in ohms? Shouldn't it be henries?
James said:
1 decade ago
Xl also has some form of resistance
Cherry said:
1 decade ago
Simply replace with 180 and 90 and solve
1st find out the current in the loop ...to find Vth
1. 30/sqrtof(180 and 90) with angle ll get
2. then multiply with Xl to get Vth
0.15*90 at angle 90
Ans.13.25 at an angle 63.4
1st find out the current in the loop ...to find Vth
1. 30/sqrtof(180 and 90) with angle ll get
2. then multiply with Xl to get Vth
0.15*90 at angle 90
Ans.13.25 at an angle 63.4
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