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A transformer actually hasn't a power, it has a maximum continous power capability, the product of nominal current and voltage. The core size gives a basical hint to the expectable power capacity, in case of small molded transformers, the winding resistance in addition.
I don't think it can be measured. The power of transformer determined from the design. One of the parameter has been told FvM. The core determined the nominal voltage and for addition the size of conductor will determine the current capacity.[/i]
Hi,
May be you can connect the transformer to the mains volatage and connect its output to a variable resistive load and increase the output current till the output voltage drops to the allowable limit as permitted by the load regulation specification. Then you can take the product of the output current and the output volatge as the max usable power output of the transformer, provided the temperature rise of the transformer is within permisible limit at the load current measured. You have to further reduce this rating for nonresistive loads by the power factor.
Plus, if you know the rated output voltage, you can supply the primary winding with the rated input voltage, then adjust the potentiometer until you get the rated output voltage measurement, measure the output current, you will get the power capability of the transformer.
Note that you can use the dimensions of the transformer core for rough calculation of transformer power only, because you cannot know the quality of the core steel.
The power of transformer depend on the application also.
If you use it with a capacitor or an inductor as load then the measure with potentiometer isn't so useful.
If you connect the secondary winding to a bridge and a filter capacitor then the current is no more a sine. You will have very high peaks around the maximum and the minimum of the voltage.
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