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
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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