This is just for me to understand basic household economics. Let's say my electricity provider charges me 1$ for a kWh and let's say I have a device which claims to consume 100W running in my household.

Does this mean, that it will cost me 0.1 dollars per hour? Did I understand it correctly?

  • \$\begingroup\$ Yes. \$\endgroup\$
    – endolith
    Jun 19, 2011 at 22:41

1 Answer 1


You are correct. From Wikipedia:


A heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt hour (equivalent to 3.6 megajoules) of energy.

Using a 60 watt light bulb for one hour consumes 0.06 kilowatt hours of electricity. Using a 60 watt light bulb for one thousand hours consumes 60 kilowatt hours of electricity.


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