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 1 of 3.
Pokhor said:
5 years ago
Step up transformer. It means in ni/n2 n2 ( n2 which is the sec winding) is greater. Therefore the primary winding has to be less. The primary voltage cannot be larger than secondary cannot be, Such as 90.
(1)
Knowledge said:
1 decade ago
Turns ratio = (Number of turns in the hv winding)/(Number of turns in the lv winding).
For step up transformer primary winding is lv winding and secondary winding is hv and vice-versa.
For step up transformer primary winding is lv winding and secondary winding is hv and vice-versa.
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.
Ram said:
9 years ago
Hey @Knowledge,
If Turns ratio = (Number of turns in the have winding) / (Number of turns in the lv winding).
Then how turns ratio = 0.1?
If Turns ratio = (Number of turns in the have winding) / (Number of turns in the lv winding).
Then how turns ratio = 0.1?
Waheed khan said:
3 years ago
@All
Here is my clarification;
When K<1 use N2/N1 or Ns/Np or Vs/Vp or V2/V1.
And
When K>1 use N1/N2 or Np/Ns or Vp/Vs or V1/V2.
Here is my clarification;
When K<1 use N2/N1 or Ns/Np or Vs/Vp or V2/V1.
And
When K>1 use N1/N2 or Np/Ns or Vp/Vs or V1/V2.
(2)
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.
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
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.
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.
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.
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