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What Is 500ma Watts. You are asking an apples and oranges question. In your case, 19.5v x 3.34a = 65.13w, which is about the 65w listed.
50 ma to watt/volt = 0.05 watt/volt. In the metric system, an ampere is the unit for measuring and representing electric current. 500 ma to watt/volt = 0.5 watt/volt.
Create variable power supply, LM317 current regulator, LM317, voltage regulator
In your case, 19.5v x 3.34a = 65.13w, which is about the 65w listed. 200 ma to watt/volt = 0.2 watt/volt. To convert amps to watts for a 12v dc 500ma power supply, enter 12 volts and.5 amps. 500 ma to watt/volt = 0.5 watt/volt.