Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?
A) 110 W
B) 880 W
C) 27.5 W
D) 440 W
E) not enough information to say

Question

Quizplus · Accepted Answer

The power output of the secondary coil is equal to the power input of the primary coil. The power input of the primary coil is equal to the voltage across the primary coil multiplied by the current in the primary coil. Therefore, the power output of the secondary coil is equal to 110 V * 4 A = 440 W.

Four Amperes of Current Exist in the Primary Coil of a Transformer