A small air compressor operates on a 1.7 hp (horsepower) electric motor for 9.2 hours a day. How much energy is consumed by the motor daily?

 1 hp equals about 750 watts. Answer in units of J.

If electricity costs 25 cents per kilowatt-hour, how much does it cost to run the compressor each day? Answer in units of cents.

4 Answers

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  • 1 month ago
    Favourite answer

    power = 750•1.7 = 1275 watts = 1275 J/s

    9.2 hr x 3600 s/hr = 33120 s

    1275 J/s x 33120 s = 4.22e7 J

    4.22e7 J = 11.73 kW•hr

    11.73 kW•hr x 25¢/kW•hr = 293 ¢

  • oubaas
    Lv 7
    1 month ago

    total daily energy consumption E = 1.7*0.75*9.2 = 11.73 kwh

    daily expenditure = 11.73*25 = 293 cents 

  • 1 month ago

    Dimensional analysis problem

    1.7hp * 0.750kW/hp *9.2h * 25¢/kWh = 293¢ <<<< 

  • 1 month ago

    $2.93 (1.7 x 750 = 1275W) (1275/1000 = 1.275 KW) (1.275 x 9.2 = 11.73 KWH per day) (11.73 x 0.25 = $2.93).

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