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Class 12 NEET Physics Electromagnetic Induction and Alternating Currents
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© examsnet.com
Question : 67
Total: 114
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn b the primary windings of the transformer is
(2010)
3.6 ampere
2.8 ampere
2.5 ampere
5.0 ampere
Validate
Solution:
Here, Input voltage,
V
p
=
20
V
Output voltage,
V
s
=
440
V
Input current,
I
p
=
?
Output current,
I
s
=
2
A
Efficiency of the transformer,
η
=
80
%
Efficiency of the transformer,
η
=
output power
Input power
η
=
V
s
I
s
V
p
I
P
or
=
5
A
I
p
=
V
s
I
s
η
V
p
=
(
440
V
)
(
2
A
)
(
80
100
)
(
220
V
)
=
(
440
V
)
(
2
A
)
(
100
)
(
80
)
(
220
V
)
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