The formula for watts is W = A x V.
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MW is a unit of power just like kW 1MW = 1000 kW 1 mega-watt = 1000 kilo-watt Watt is a measurement of power. watt-hour is a unit of energy 1 mega-watt-hour = 1000 kilo-watt-hour
It will power two 400 watt lamps.
A watt hour is a unit of energy, not time -so you cannot ask how 'long' it is. The time taken to consume a watt hour of energy depends upon the rate (i.e. the power) at which it is consumed, expressed in watts. A watt hour is defined as the amount of energy consumed, over a period of one hour, at the rate of one watt.
It depends on the wattage of the unit. When that is found use the formula; Amps = Watts/Volts to find your answer.
40 watt light bulb. This is obvious. Go do an experiment. -_-