A step down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is
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a
4.65 mA
b
0.045 A
c
0.45 A
d
4.65 A
answer is C.
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Detailed Solution
(3)Efficiency η=output powerInput power⇒ 88100=880Pi ⇒ Pi=1000 W.Input current Ii=PiVi=10002200 A=0.45 A
A step down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is