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Watts=current x voltage so to derive current from watts and voltage you:
Current = Watts / Volts
Or in your case I= 15/12 = 1.25 amps
This is basic Ohms law. If you don't know it then you should learn it. Power(W) is Voltage (V or E) multiplied by Current (I). So to solve for current: I=W/V.
Another helpful basic equasion from Ohms Law is V=I*R
You can use a calculator like this: http://www.supercircuits.com/resources/tools/volts...
which (just to answer the original question) is 1.25 amps
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