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Voltage and Amps...
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Ed_McCarron:

--- Quote from: Wade on October 25, 2007, 11:08:44 pm ---A 300 watt power supply at 110 VAC from the wall is about 300/110 or 3 Amps.

--- End quote ---

3A on the input side.

To simplify, look at straight AC:

A 120v -> 12v transformer (dividing by 10) drawing 3A on the 120v side is capable of supplying 30A (multiply by 10) on the 12v side.

Less core loss and such.
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