How many watts is 12 amps?
Must know two parts of the equation before the other can be answered. However, assuming there is 110vac applied, then the answer would be about 1,320 watts.
Amps * Volts = Watts You don't indicate the voltage, so it's not possible to calculate the Amps... however; Assuming 120 Volts Amps * 120 Volts = 360 Watts OR Amps = 360 Watts/120 Volts OR Amps = 3 Assuming 12 Volts Amps * 12 volts = 360 Watts OR Amps = 360 Watts/120 Volts OR Amps = 30 If neither applies to your situation... you do the math.
385 Clarification: You need to specify voltage AND AMPS to know the watts. As such, the above answer is irrelevant. At 12 volts, 3.5 amps would be 42 Watts At 110 Volts, 3.5 amps would be 385 Watts At 120 Volts, 3.5 amps would be 420 Watts At 240 Volts, 3.5 amps would be 840 Watts The general formula is: Amps * Volts = Watts