1 hp = 746 watts
2 hp = 1,492 watts
2 hp x 1 hour = 1,492 watt-hours = 1.492 kWh
(Note: The "2 hp" rating on the pump refers to the useful output, that is,
the water that the pump moves. The '1.492 kWh' calculated is simply the
equivalent of 2 hp-hour, expressed in a different unit. The consumption
from the electric utility will be more than that, because no machine is
100% efficient, that is, a machine's useful output work/energy is always
less than the input to it.
To calculate the input energy required to operate this pump at full load
for an hour, divide 1.492 kWh by the efficiency of the pump.)
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KWH
The two sets of units are not compatible. While a gallon may be converted to a litre, there is no relationship between kWh and hour.
Watt, kilowatt, or megawatt are units of power (energy/time). A watt is 1 joule/second. A kilowatt is a thousand joules per second. A kilowatt is also 1 kWh/hour (kilowatt-hour / hour). Since you would usually pay per kilowatt-hour, you might be more interested in the number of kilowatt-hours. A megawatt is a million joules per second - or a thousand kWh/hour.
A 60W bulb will use 60W X 1 hour / 1000. this will give you the KWh - the units your electricity company uses to charge you.So 60 X 1 =6060/1000 =0.060 Kwh
One kWh has 2.25 x 1025 eV. (The electron-volt is a very small unit, used in particle physics.)