How much electricity would an 11-watt light bulb use if left on for say 5 hours? And how much would this cost?
My flat mate argues that an 11-watt bulb does not use much electricity and can thus be left on constantly. I don’t think this is very environmentally or economically friendly, can someone please give me some figures to back up my argument?! Thank you.
there are 720 hours in a month, so the amounts to 11×720 or 7920 watt hours, or 7.9 kW-hrs.
Costs vary. At 10¢ per kW-hr, that is 79¢ per month.
for 5 hours, that is 0.055 kw/hrs at a cost of 0.5¢
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