Physicshard · Past Paper
Which of the following describes the efficiency of a transformer?
AOutput Power / Input Power * 100%
BInput Power / Output Power * 100%
COutput Voltage / Input Voltage * 100%
DSecondary Turns / Primary Turns * 100%
✓ Correct Answer: A — Output Power / Input Power * 100%
Efficiency is the ratio of useful output energy (or power) to total input energy (or power).
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