Electrical Engineering - Circuit Theorems and Conversions - Discussion
Discussion Forum : Circuit Theorems and Conversions - General Questions (Q.No. 1)
1.
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.
4.16 V, 120 
41.6 V, 120
4.16 V, 70
41.67 V, 70
Discussion:
42 comments Page 3 of 5.
Ayushi said:
1 decade ago
Actually your doubt is common one, which usually strikes the mind anirban but R3 is not the load resistance infact the load is on a b terminal, and the load is not shown at the terminals. So the answer given that is 70 is correct.
(1)
Maheshwaran said:
1 decade ago
Vth = R3*(Vs/(R1+R2+R3))= 120*(100/(68+100+120)) = 41.67 V.
Rth = R3//(R1+R2) = (120*160) / (120 + 168)= 70 ohm.
Rth = R3//(R1+R2) = (120*160) / (120 + 168)= 70 ohm.
Akshit raulji said:
1 decade ago
First of all open 120 ohm resistance because Vth is find across it so it should be open than applied voltage divider rule.
Vth = 100*68/(68+100). So we get 40.47v.
Vth = 100*68/(68+100). So we get 40.47v.
K.Hanumantha said:
1 decade ago
Friends.
According to Thevenin theorem voltage should be short while calculating of resistor Rth, when we do that, R3 is parallel with (r1+r2). So equivalent, 168//100 = 70 ohm Rth.
Vth = r3*I. where I = Vs/(r1+r2+r3) = 100/(68+100+120) = 0.3472A.
We need Vth = I*r3 = 0.3472*120 = 41.67V.
According to Thevenin theorem voltage should be short while calculating of resistor Rth, when we do that, R3 is parallel with (r1+r2). So equivalent, 168//100 = 70 ohm Rth.
Vth = r3*I. where I = Vs/(r1+r2+r3) = 100/(68+100+120) = 0.3472A.
We need Vth = I*r3 = 0.3472*120 = 41.67V.
Khinya Ram Choudhary said:
1 decade ago
Let R = R1+R2;
Rth = R||R3;
According to Thevenin Theorem:
Rth = (168*120/(168+120)) = 70 Ohm.
Vth is Thevenin voltage Between A&B,
According to Voltage Divider Rule:
Vth = Vs*R3/ (R+R3).
= 41.67 V.
Rth = R||R3;
According to Thevenin Theorem:
Rth = (168*120/(168+120)) = 70 Ohm.
Vth is Thevenin voltage Between A&B,
According to Voltage Divider Rule:
Vth = Vs*R3/ (R+R3).
= 41.67 V.
Thangam said:
1 decade ago
I need simple formula for solving these circuit analysis.
Prabha said:
1 decade ago
I can't understand.
Anshu said:
10 years ago
When we have to find the venin voltage b/w two terminal then, firstly we have to remove the load resistance b/w these terminal. So why all are considering r3?
Naveen said:
10 years ago
Rth = 168.
Vth = 100 V.
Vth = 100 V.
Aaron said:
10 years ago
In what world is R3 parallel to R1 and R2? they look in series to me. It is parallel to the load yet, but not with R1 and R2. The definition of parallel connection is that it shares two or more nodes, and this simply does not. I am confused.
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