A stepdown transformer reduces the voltage of a transmission line from 2200V to 220V.The power delivered by it is 880 W and its efficiency is 88%.The input current is

Options

A. `4.65` mA
B. `0.0465` A
C. `0.465` A
D. `4.65` A

Explanation

Efficiency, `eta = ("output power")/("input power")` = `(P_(0))/(P_(i)) = (880)/(P_(i))`
or `P_(i) = 880 xx (100)/(88) = 1000 W`
`I_(P) = ("Power at input")/("Voltage at input') = (1000)/(2200) = (5)/(11) = 0.4545 A`
`therefore I_(P)` = Input current = 0.4545A
This option is not provided in the question paper.