Neither, since the units are not compatible.
The dimensions for Joules are [ML2T-2].
The dimension for Watts are [ML2T-3] so that those for Watts per second are [ML2T-4]. The dimensions are unequal and so conversion between the two measures is not valid.
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Add up all the individual watts, convert everything to kilowatts, then multiply by the number of hours.
1 hp = 746 watts Easy way to remember this: -- According to the description in his diary, the sails of Christopher Columbus' ship the Santa Maria could have developed about 2 hp in a fresh gale. -- 1/2 of 1492 = 746 .
To answer this question, you need to know how many amps the circuit that is connected to the light bulb can handle. For home applications with a 15 amp circuit and no other loads connected you get: Power = Current * voltage, Substituting the known information yields: power = 15 amps * 110 volts, which is 1650 watts of total capacity. You have 100 watt bulbs, so: 1650/100 = 16.5 bulbs If your circuit is other than 15 amps, or if there is additional loads on the circuit, you must adjust the current or total capacity accordingly