1.

A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary coil? Comment on the types of transformer being used.A. `0.27 mA`B. `2.7 A`C. `0.27 A`D. `10 A`

Answer» Correct Answer - C
Here, `P_(s)=60 W, I_(s)=0.54 A, V_(p)=220 V`
`therefore V_(s)=(P_(s))/(I_(s))=(60)/(0.54)=111 V`
As`(V_(s))/(V_(p))=(I_(p))/(I_(s))`, for anideal transformer
`therefore I_(p)=(V_(s))/(V_(p))xxI_(s)=(111)/(220)xx0.54=0.27 A`


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