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

Thread starter johann1301
Start date Apr 5, 2014
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Transformer

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The transformer AC/AC has an ingoing power of 27W and an outgoing power of 20VA, indicating a loss of approximately 7 J per second due to heat. The difference between watts (W) and volt-amperes (VA) is primarily due to the power factor, which accounts for the phase difference between voltage and current in AC circuits. Watts measure real power, while volt-amperes measure apparent power, which can include reactive power. The use of VA on the outgoing line suggests that the transformer may not be fully efficient, reflecting its real-world performance. Understanding this distinction is crucial for evaluating transformer efficiency and performance.

Apr 5, 2014

johann1301

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

Wich 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: Apr 5, 2014

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Apr 5, 2014

CWatters

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Google "What is the difference between VA and W" without the quotes.

Apr 5, 2014

johann1301

Thanks:)

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