匿名
匿名 發問於 科學及數學其他 - 科學 · 8 年前

physics

How many k kilowatt hours are used by a 1002 light bulb in 5hours?

1 個解答

評分
  • 天同
    Lv 7
    8 年前
    最愛解答

    I suppose you are referring to a 100-watt light bulb.

    1 watt = 1 J/s, hence 100 w = 100 J/s

    1 hour = 3600 s, hence 5 hours = 5 x 3600 s = 18 000 s

    Therefore, energy consumed by the light bulb

    = 100 J/s x 18000 s = 1.8 x 10^6 J

    1 kilowatt-hour = 1000 watt-hour = 1000 watt x 1 hour = 1000 J/s x 3600 s

    = 3.6 x 10^6 J

    No. of kilowatt-hour consumed by the light bulb

    = 1.8 x 10^6/3.6x10^6 = 0.5

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