Figure shows an iron - cored transformer assumed to be 100% efficient. – McqOptions

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1.	Figure shows an iron - cored transformer assumed to be 100% efficient. The ratio olf the secondary turns to the primary turns is 1:20. A 240 V ac supply is connected to the primary coil and a 6 W resistor is corrected to the secondary coil. What is the current in the primary coil?
A.	0.10 A
B.	0.14 A
C.	2 A
D.	40 A
Answer» B. 0.14 A

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