(Solution) - The efficiency e of a transformer is defined as the -(2025 Original AI-Free Solution)

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The efficiency e of a transformer is defined as the ratio of the power output to the power input, or e = Ps/PP.
(a) Show that for an ideal transformer, this expression gives an efficiency of 100%(e = 1.00).
(b) Suppose a step-up transformer increased the line voltage from 120 to 240 V, while at the same time the output current was reduced to 5.0 A from 12 A. What is the transformer?s efficiency? Is it ideal?