How much does it cost to operate a 90 W light bulb for one day if the cost per kilowatt-hour is $0.08

Question

How much does it cost to operate a 90 W light bulb for one day if the cost per kilowatt-hour is $0.08

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Thu Giang 5 years 2021-08-06T18:51:27+00:00 1 Answers 152 views 0

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  1. Nem
    0
    2021-08-06T18:53:18+00:00
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    Answer:

    $ 0.17

    Explanation:

    From the question given above, the following data were obtained:

    Power (P) = 90 Watts

    Time (t) = 1 day

    Cost per KWh = $ 0.08

    Cost of operation =?

    Next, we shall convert 90 W to KW. This can be obtained as follow:

    1000 W = 1 KW

    Therefore,

    90 W = 90 W × 1 KW / 1000 W

    90 W = 0.09 KW

    Next, we shall express 1 day in hour. This is shown below:

    1 day = 24 hours

    Next, we shall determine the energy consumption. This can be obtained as follow:

    Power (P) = 0.09 KW

    Time (t) = 24 h

    Energy (E) =?

    E = Pt

    E = 0.09 × 24

    E = 2.16 KWh

    Finally, we shall determine the cost of operation. This can be obtained as follow:

    Energy (E) = 2.16 KWh

    Cost per KWh = $ 0.08

    Cost of operation =?

    Cost of operation = Energy × Cost per KWh

    Cost of operation = 2.16 × 0.08

    Cost of operation = $ 0.17

    Thus, the cost of operating the light bulb for one day is $ 0.17

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