Transformer Efficiency & Losses review (3)

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4 Terms

1
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How do you calculate transformer efficiency?

η (%) = (Pout / Pin) × 100.

2
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A transformer has Pin=14,250 W and Pout=13,750 W. What is its efficiency?

η = 13,750/14,250 × 100 ≈ 96.5%.

3
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List the three types of transformer power loss.

Copper loss (I²R in windings), eddy current loss (swirling currents in the core), and hysteresis loss (magnetic domain reversal loss).

4
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Name two ways to reduce transformer heat/power losses.

Submerge in oil to dissipate heat; laminate the core to reduce eddy currents.