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How much energy (in kWh) does this drive use per month?

  • A computer CD-ROM drive that operates on 120V is rated at 34W when it is operating. a) How much energy (in kWh) does this drive use per month assuming it operates 30min per day? b) Estimate the electric energy bill per month, assuming 15 cents per kWh.

  • Answer:

    Energy E = P x t E = 34 W x 30 x 1/60 hr E = 17Wh = 0.017kWh per day for a month E = 0.017 x 30 = 0.51kWh per month monthly bill 0.51 x 15 cents.

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a) energy consumed E = P x t = 34 x 30 x 0.5 = 510 wh = 0.51 kwh b) cost = 0.51 x15 =7.65 cents.

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