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)27.5 W
B)110 W
C)440 W
D)880 W
E)not enough information to say

Question

Quizplus · Accepted Answer

The power output of the secondary coil can be calculated using the formula P = IV, where I is the current in the secondary coil and V is the voltage across it. Since the transformer is ideal, the input power (110 V x 4 A = 440 W) is equal to the output power. Therefore, if the current in the secondary coil is, for example, 2 A, then the voltage across it must be 220 V (P = IV = 2A x 220V = 440W). However, we don't know the current in the secondary coil, so we can't calculate the power output directly.

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