Five kilovolts equals zero watts. The formula you need to use is W = A x V.
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746 watts equals one horsepower.
The formula you are looking for is I = W/E. Amps = Watts/Volts.
You need to know the volts of the device to answer the question, if it's a household appliance (120v) then the answer is 36 watts, if it's an automobile device (12v) then the answer is 3.6 watts
Watts are a unit of power. So 40 watts of power to an LED are the same as 40 watts of power to a fluorescent. Sometimes LEDs are rated in equivalent watts which is an attempt to relate watts to brightness or lumens. You need to compare lumens and the "temperature" of the bulbs in Kelvin to get the comparison I think you are looking for.
To find an amperage, you divide the wattage by the voltage.