The 100-watt light bulb will be in operation for approximately 22 hours and 40 minutes before it burns out. The lifespan of a 100-watt light bulb is approximately 1,000 hours.
A 100-watt light bulb uses 100 watts of energy, which is equivalent to 0.01 kilowatts (kW). One kilowatt hour is equivalent to 3,412 BTUs or 746 British thermal units (Btus). To determine how much energy it takes to power a 100-watt light bulb for 1 hour, multiply the number of watts by the number of hours. For example, if you want to know how much energy a 100-watt light bulb uses for 20 minutes, multiply 20 minutes by 0.01 kW or 0.0001 kW.
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Last modified: October 13, 2022