Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 11)
11.
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
Answer: Option
Explanation:
We know that, V2/V1 = N2/N1.
Given V2 = 9v, N2/N1 = 0.1
Therefore, 9v/V1 = 0.1
V1 = 9v/0.1 = 90v.
For more detail: Step Down Transformer - Circuit with Simulation.
Discussion:
24 comments Page 2 of 3.
Suda said:
1 decade ago
Can anybody explain turns ratio is either n2/n1 or n1/n2?
SADDAM HUSSAIN said:
1 decade ago
Turn ratio is N1/N2= 0.1.
V2/V1 = N2/N1 = 10.
9/V1 = 10.
V1 = 9/10.
SO V1 = 0.9V.
V2/V1 = N2/N1 = 10.
9/V1 = 10.
V1 = 9/10.
SO V1 = 0.9V.
Sivaranjan said:
1 decade ago
Turns ratio means N1/N2 not N2/N1. Thus it should be 0.9V. I am agreed with all above who got 0.9V.
Chandra said:
1 decade ago
I agree with @Ajeet.
Turns ratio = n1/n2 but not n2/n1 it is transformation ratio.
Therefore v1/v2 = n1/n2.
v1/0.9 = 9=>v1 = 0.9v.
Turns ratio = n1/n2 but not n2/n1 it is transformation ratio.
Therefore v1/v2 = n1/n2.
v1/0.9 = 9=>v1 = 0.9v.
Ajeet chaubey said:
1 decade ago
Turns ratio(T.R) = N1/N2 = V1/V2 = I2/I1.
And,
Transformation ratio = 1/T.R.
Here,
T.R. is given,
So N1/N2 = 0.1=V1/V2, => V1 = 0.1*9 = 0.9.
And,
Transformation ratio = 1/T.R.
Here,
T.R. is given,
So N1/N2 = 0.1=V1/V2, => V1 = 0.1*9 = 0.9.
Eng/Attiya said:
1 decade ago
The turns ratio is under 1 so this is step up transformer meaning that Vp should less than Vs.
Ankur said:
1 decade ago
I think voltage is proportional to current means v1/v2 = n1/n2.
By this we will get 0.9 answer.
By this we will get 0.9 answer.
Ravindra rawat said:
1 decade ago
We know that,
k = v2/v1 = n2/n1.
n2/n1 = 0.9.
v2 = 9v.
v1 = 9/0.9 = 90v answer.
k = v2/v1 = n2/n1.
n2/n1 = 0.9.
v2 = 9v.
v1 = 9/0.9 = 90v answer.
Siri said:
1 decade ago
Turns ratio=N2/N1 not N1/N2.
Himanish said:
1 decade ago
I agree with Yogesh
Turns Ratio is N1/N2=0.1
Therefore V1=(N1/N2)*V2
We get 0.9V
Always n1/n2=Turns Ratio
Turns Ratio is N1/N2=0.1
Therefore V1=(N1/N2)*V2
We get 0.9V
Always n1/n2=Turns Ratio
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