How would you calculate the percentage efficiency of a transformer given input power and output power?

Study for the NEIEP Magnetism and Electromagnetism (355) exam. Prepare with our interactive quizzes, multiple-choice questions, and detailed explanations. Ace your test and enhance your knowledge on magnetism principles.

Multiple Choice

How would you calculate the percentage efficiency of a transformer given input power and output power?

Explanation:
Efficiency is the fraction of input power that actually appears as useful output, expressed as a percentage. It’s defined as the output power divided by the input power, times 100. So the correct form is P_out / P_in × 100%. This makes sense: if the device could use all the input power, P_out would equal P_in and efficiency would be 100%. In real transformers, losses mean P_out is less than P_in, giving η < 100%. For a quick check, if input is 1000 W and output is 900 W, η = 900/1000 × 100% = 90%.

Efficiency is the fraction of input power that actually appears as useful output, expressed as a percentage. It’s defined as the output power divided by the input power, times 100. So the correct form is P_out / P_in × 100%. This makes sense: if the device could use all the input power, P_out would equal P_in and efficiency would be 100%. In real transformers, losses mean P_out is less than P_in, giving η < 100%. For a quick check, if input is 1000 W and output is 900 W, η = 900/1000 × 100% = 90%.

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