Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 4)
4.
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 
?
?250
25
6,250
62,500
Discussion:
46 comments Page 1 of 5.
HRD said:
2 years ago
R1 = (N1/N2)^2 * RL,
R1 = (50/10)^2 * 250,
R1 = 6250.
R1 = (50/10)^2 * 250,
R1 = 6250.
(6)
Suresh said:
4 years ago
Voltage of secondary 200v, transformer ration N1:N2= 200:100, X=12 Ohms and Rl = 4 Ohms.
Estimate the RMS value of the primary current I1 and Secondary Current I2 and Estimate the power in watts.
Estimate the RMS value of the primary current I1 and Secondary Current I2 and Estimate the power in watts.
Richa said:
5 years ago
Transformation ratio is N1 (Primary)/N2 (secondary).
Majid Mahmood said:
6 years ago
According to my calaculation:
v1i1 = v2i2
v1*v1/r1 = v2*v2/r2
(v1/v2)^2 = r1/r2.
We know n1/n2 = v1/v2
so (50/10)^2 = r1/250 => 25 = r1/250,
r1 = 250 * 25 = 6250.
v1i1 = v2i2
v1*v1/r1 = v2*v2/r2
(v1/v2)^2 = r1/r2.
We know n1/n2 = v1/v2
so (50/10)^2 = r1/250 => 25 = r1/250,
r1 = 250 * 25 = 6250.
(12)
Vaibhav said:
7 years ago
Can I find reflected impedance or turns ratio if the only efficiency of the transformer is provided?
(1)
Abhishek mohapatra said:
8 years ago
From the basics:
You have to find what resistance on primary will have similar effect as 250 on secondary.
in ideal transformer power associated with primary equals secondary hence V2^2/250 = v1^2/Rreq. similarly V2*I2 =V1*I1. if you know what voltages are related in the same way as a number of turns i.e V2/V1 = N2/N1 then you can easily relate all currents and impedances.
You have to find what resistance on primary will have similar effect as 250 on secondary.
in ideal transformer power associated with primary equals secondary hence V2^2/250 = v1^2/Rreq. similarly V2*I2 =V1*I1. if you know what voltages are related in the same way as a number of turns i.e V2/V1 = N2/N1 then you can easily relate all currents and impedances.
TUTUN MONDAL said:
8 years ago
K=N2/N1=1/5.
SECONDARY TO PRIMARY R1=R2/K^2 =250/(1/5)^2=250*25=6250OHMS.
SECONDARY TO PRIMARY R1=R2/K^2 =250/(1/5)^2=250*25=6250OHMS.
(5)
Sumit said:
8 years ago
If primary side 1000 turn and 1000 watt on primary side find out secondary side pawer in watt if seconady turn 100.
(1)
Paul said:
8 years ago
Ododo is the only one making sense here.
k = turns ratio = N2/N1 (This is most often the conclusion based on the 20mins I've spent on the web researching this).
k = turns ratio = N2/N1 (This is most often the conclusion based on the 20mins I've spent on the web researching this).
(2)
Tom said:
8 years ago
Here, n2/n1=r1/r2.
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