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The result is that the transformer runs cool and contented.

The '250 KVA' rating on the transformer is its maximum ability to

transfer power from its input to its output without overheating,

NOT an amount of power always running through it.

If the 3 KVA load happens to be the only thing connected to the

transformer at the time, then only 3 KVA flows into the transformer

from the primary line, and only 3 KVA leaves the transformer secondary.

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