Effect of Transformer AC/AC: 27W Ingoing, 20VA Outgoing

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SUMMARY

The discussion centers on a transformer AC/AC with an ingoing effect of 27W and an outgoing effect of 20VA, indicating a loss of approximately 7 J per second to heat. The distinction between watts (W) and volt-amperes (VA) is highlighted, with the user seeking clarification on why the outgoing measurement is expressed in VA rather than W. This difference is crucial for understanding the transformer's efficiency and performance characteristics.

PREREQUISITES
  • Understanding of electrical power concepts: watts (W) and volt-amperes (VA)
  • Basic knowledge of transformer operation and efficiency
  • Familiarity with power loss calculations in electrical systems
  • Awareness of electrical units and their significance in AC circuits
NEXT STEPS
  • Research the differences between watts and volt-amperes in AC circuits
  • Study transformer efficiency and power loss calculations
  • Explore the principles of heat loss in electrical components
  • Learn about the impact of power factor on transformer performance
USEFUL FOR

Electrical engineers, technicians working with transformers, and students studying electrical engineering concepts will benefit from this discussion.

johann1301
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I have a transformer AC/AC which says that the ingoing effect is 27W and the outgoing effect is 20VA.

which means it loses about 7 J every second to heat. (?)

Any idea as to why it is written as VA instead of W on the outgoing line?
 
Last edited:
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Google "What is the difference between VA and W" without the quotes.
 
Thanks:)
 

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