A current of 5A is flowing at 220V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50% of power is lost, then the current in the secondary coil will be –

Options

A. 2.5 A
B. 5A
C. 0.25 A
D. 0.5 A

Answer

C

Explanation

Given, `V_(p)=220V,V_(S)=2200V,l_(p)=5A ` and Power loss =50%
Efficiency of transformer `(eta)` is defined as the ratio of output power and input power
i.e., `eta%=(P_("out"))/(P_("in"))xx100=(V_(S)l_(S))/(V_(p)l_(p))xx100`
`50=(2200xxl_(S))/(220xx5)xx100=0.25A`