Radiodoc
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:Transformers are rated in VA rather than power (W). The temperature rise (and the losses) of a xfmr are related to the load VA rather than the load W.
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:For example, assume that the load is purely inductive (or capacitive). The power delivered to the load is zero (because the load current and voltage are 90 deg out of phase). But the xfmr may get quite warm, even hot, because: A)the winding is carrying current, giving I^2R losses, and B) the core is continually being magnetized and remagnetized, causing core losses.
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:But, yes, if you are given load power (W) and, say, the voltage, then to compute xfmr current (A), you need to know the load's power factor.
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:Now, I forget, what was the question? ;>)
:Doug
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::::Technically shouldn't the transformers power factor be taken into consideration in figuring the transformer's power using its VA rating?
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::::Radiodoc
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