"Strictly speaking, you cannot convert Watts to Volts to Amps, because they measure different things. Amps are the measure of the number of electrons that pass a specific point in a second. Volts are the measure of the force each electron is under. And Watts are a measure of power (Amps times Volts). If you know two of the three, you can calculate the third. The equation to find Amps is:
. Watts/Volts = AmpsFor example: 240 watts/12volts = 20 AmpsThe equation to find Watts is: Amps * Volts = WattsFor example: 1 amp * 110 volts = 110 wattsThe Equation to find Volts is: Watts/Amps = VoltsFor example 18 watts/1.5 amps = 12 voltsThe relationship is like liquid going through a hose. A gallon per minute (amps) dribbles out if under low pressure (low voltage). But if you restrict the end of the hose, it takes more pressure to move the liquid. This liquid then comes out with more power (watts), even though it is still only one gallon per minute. In the same way when the voltage is increase, the same amperage produces more wattage."
