Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 3)
3.
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
Discussion:
69 comments Page 1 of 7.
Abdul Rauf Ansari said:
1 decade ago
We know that:
Turn ratio of transformer is define as the ratio of turns of the wire in the primary winding to the number of turns of the wire in secondary winding.
i.e Turn ratio = N1/N2.
Given: N1/N2 = 20.
Primary side voltage V1= 12 volt.
Secondary voltage V2 = ?
Hence according to voltage transformation ratio.
V2/V1 = N2/N1 = I1/I2 = K.
Or, V2/V1 = N2/N1.
Or, V2 = N2/N1*V1.
= 1/20*12.
= 0.6 volt.
Turn ratio of transformer is define as the ratio of turns of the wire in the primary winding to the number of turns of the wire in secondary winding.
i.e Turn ratio = N1/N2.
Given: N1/N2 = 20.
Primary side voltage V1= 12 volt.
Secondary voltage V2 = ?
Hence according to voltage transformation ratio.
V2/V1 = N2/N1 = I1/I2 = K.
Or, V2/V1 = N2/N1.
Or, V2 = N2/N1*V1.
= 1/20*12.
= 0.6 volt.
Biswajit barik said:
6 years ago
No, the right answer is 0.6V in case of the ideal transformer if we assume permeability is infinite in ideal transformer then in case of ideal transformer in loaded condition N1I1=N2I2so in that condition we say I1/I2=N2/N1=1/a so that but practical transformer with finite permeability then this relation not valid because of I=Inot+I2.
Here transformation ration only practical transformer is E1/E2=N1/N2.
Here transformation ration only practical transformer is E1/E2=N1/N2.
(4)
Jyoti said:
9 years ago
Ans.is 0.6.
Because Turns ratio for the transformer is N1/N2.And It's already given in data.
Now, when we calculate the secondary voltage by transformation ratio. Then it will become
N2/N1 = V2/V1,
1/20 = V2/12,
V2 = 12/20,
V2 = 0.6 volts.
According to me, the options are wrong.
Because Turns ratio for the transformer is N1/N2.And It's already given in data.
Now, when we calculate the secondary voltage by transformation ratio. Then it will become
N2/N1 = V2/V1,
1/20 = V2/12,
V2 = 12/20,
V2 = 0.6 volts.
According to me, the options are wrong.
Instructor said:
7 years ago
Anyone that got 240 volts for a secondary voltage is incorrect.
The correct answer should 0.6 volts.The reason being is that the equation for turns ratio is (N1/N2)=(V1/V2). We are given (N1/N2) - our turns ratio - to be 20 and V1 is 12. So, 20=12/V2, therefore, V2 is 0.6.
The correct answer should 0.6 volts.The reason being is that the equation for turns ratio is (N1/N2)=(V1/V2). We are given (N1/N2) - our turns ratio - to be 20 and V1 is 12. So, 20=12/V2, therefore, V2 is 0.6.
(1)
Krishna said:
1 decade ago
Given, k=20 (k=turns ratio).
And primary AC voltage is 12v,
We have to find secondary voltage = ?,
As we know that, turns ratio = k = N2/N1,
K=N2/N1=20.
(SECONDARY VOLTAGE/PRIMARY VOLTAGE) = v2/v1 = v2/12,
THEREFORE,
N2/N1= V2/V1,
20 = V2/12
V2 = 20*12 = 240.
And primary AC voltage is 12v,
We have to find secondary voltage = ?,
As we know that, turns ratio = k = N2/N1,
K=N2/N1=20.
(SECONDARY VOLTAGE/PRIMARY VOLTAGE) = v2/v1 = v2/12,
THEREFORE,
N2/N1= V2/V1,
20 = V2/12
V2 = 20*12 = 240.
Suvankar said:
1 decade ago
Guys, I m confused.
The turns ratio of a transformer is T1/T2=20
Primary turns to the secondary turns is called the turns ratio.
i.e. and E1/E2=T1/T2 [Refer Ashfaq Hussian, Electric machines, page no 3]
The ans should be, E2=E1/20
i.e. E2= 12/20=0.6
Isnt it??
The turns ratio of a transformer is T1/T2=20
Primary turns to the secondary turns is called the turns ratio.
i.e. and E1/E2=T1/T2 [Refer Ashfaq Hussian, Electric machines, page no 3]
The ans should be, E2=E1/20
i.e. E2= 12/20=0.6
Isnt it??
Shujaa Rheem said:
9 years ago
The correct answer 0.6 not 240 because the turn ratio high so n1 high that lead the transformer step_down.
So the secondary voltage less than from the primary n1/n1 = 20 that represent simple k then k = v1/v2 then 20 = 12/v2 so v2 = 12/20 = 0.6.
So the secondary voltage less than from the primary n1/n1 = 20 that represent simple k then k = v1/v2 then 20 = 12/v2 so v2 = 12/20 = 0.6.
Nani said:
1 decade ago
Given ,k=20 (k=turns ratio)
and primary AC voltage is 12v,
We have to find secondary voltage=?,
as we know that, turns ratio=k=N2/N1,
K=N2/N1=20
(SECONDARY VOLTAGE/PRIMARY VOLTAGE)=v2/v1=v2/12,
THEREFORE,
N2/N1=V2/V1,
20=V2/12
V2=20*12=240
and primary AC voltage is 12v,
We have to find secondary voltage=?,
as we know that, turns ratio=k=N2/N1,
K=N2/N1=20
(SECONDARY VOLTAGE/PRIMARY VOLTAGE)=v2/v1=v2/12,
THEREFORE,
N2/N1=V2/V1,
20=V2/12
V2=20*12=240
Er. Vikash said:
10 years ago
If you don't know the correct answer. Please don't explain. There is a mistake in options.
Above most of given explanation that is wrong correct answer is V1/V2 = E1/E2 = Turn ratio.
i.e 12/v2 = 20 so v2 = 12/20 = 0.6.
Above most of given explanation that is wrong correct answer is V1/V2 = E1/E2 = Turn ratio.
i.e 12/v2 = 20 so v2 = 12/20 = 0.6.
SHARAD PAWAR said:
10 years ago
Turns ratio is means N1/N2 and transformation ratio is N2/N1 but here turns ratio is given 20.
It means N1/N2 = 20. And primary voltage (V1) = 12 V.
Also, N1/N2 = V1/V2.
So, 20/1 = 12/V2.
Hence V2 = 0.6 V.
It means N1/N2 = 20. And primary voltage (V1) = 12 V.
Also, N1/N2 = V1/V2.
So, 20/1 = 12/V2.
Hence V2 = 0.6 V.
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