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Posted by on Wednesday, May 30, 2012 at 10:52am.


A electric bill showed 1200 kilowatt hours (kWh) purchased at a cost of $150.00.

a. What does PECO charge per kWh? $0.125

b. An electric dryer is rated at 5400 W. It takes 40 minutes to dry a normal load. What is the cost per load? $0.45

c. Two 100 watt security lights are left on for 8 hours each night. What is the annual electricity cost? $_____

  • Physics - , Wednesday, May 30, 2012 at 11:39am

    2*100W*8hr/day = 1600 W-hr/day * 365day/yr = 584kWh/yr * $150/1200kWh = $73/yr

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