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.
Knowledge said:
1 decade ago
Don't try to memorize it as n1/n2 or n2/n1....It may cause trouble. Get your basics right.
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.
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.
Yogesh sabota said:
1 decade ago
I agree with farah this is incorrect
turn ratio=n1/n2=1/10
therefore
v1=0.9v
turn ratio=n1/n2=1/10
therefore
v1=0.9v
Farah said:
1 decade ago
But turn ratio Np/Ns=0.1
Then,
Vp/Vs=Np/Ns
Vp/9=0.1
Vp=9
Is it correct?
Then,
Vp/Vs=Np/Ns
Vp/9=0.1
Vp=9
Is it correct?
Adesh thakur said:
10 years ago
I am very confused what is the turn ratio & transformer ratio tell me.
Amani naidu said:
9 years ago
Turns ratio = n1/n2.
Transformation ratio = n2/n1 .
So answer is 0.9v.
Transformation ratio = n2/n1 .
So answer is 0.9v.
(1)
Mei said:
8 years ago
Turns ratio and transformation ratio is different. Please check it.
Amol said:
9 years ago
You are right @Ram.
The hv winding turns are always more than lv.
The hv winding turns are always more than lv.
Pokhor said:
5 years ago
If the turn ratio is less than 1, it is a step-down transformer.
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