How much energy does a 100-W electric bulb consume in two hours?

1 Answer
Douglas K.
Sep 21, 2017

#E = 0.2" kilowatt-hours"#

Explanation:

Most energy is measured in units of Joules, kilo-Joules, mega-Joules, or some higher multiplier but electrical energy is an exception to this rule; it is usually measured in units of kilowatt-hours (equal to about 3.6 mega-Joules).

To compute amount of kilo-Watt-hours, energy convert the Watts to kilowatts

#(100" W")/1(1" kilowatt")/(1000" W") = 0.1" kilowatts"#

Next, multiply by the hours:

#(0.1" kilowatts")(2" hours") = 0.2" kilowatt-hours"#

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