Figure shows an iron-cored transformer assumed to be 100% efficient. The ratio of the secondaty turns to the primary turns is 1:20. A 240 V ac supply is connected to the primary coil and a `6 Omega` resistor is connected to the secondary coil. What is the current in the primary coil?A. 0.10AB. 0.14AC. 2AD. 40A

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

1.	Figure shows an iron-cored transformer assumed to be 100% efficient. The ratio of the secondaty turns to the primary turns is 1:20. A 240 V ac supply is connected to the primary coil and a `6 Omega` resistor is connected to the secondary coil. What is the current in the primary coil?A. 0.10AB. 0.14AC. 2AD. 40A
Answer» Correct Answer - A the equivlent primary load is `(R_1)=((N_1)/(N_2))^(2) (R_2)=((20)/(1)^(2)) (6.0)=2400 Omega` Current in the primary coil `=(240)/(R_1) =(240)/(2400)=0.1 A`

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