If a 60 W light bulb, powered with 620,000 J of energy, in a bedside lamp is only 20 percent efficient in converting electrical energy into

Question

If a 60 W light bulb, powered with 620,000 J of energy, in a bedside lamp is only 20 percent efficient in converting electrical energy into light energy, how many joules of light energy does this light bulb produce each time?

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Dâu 4 years 2021-08-15T11:45:57+00:00 1 Answers 46 views 0

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  1. Ben
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    2021-08-15T11:47:30+00:00
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    Answer:

    720 Joules

    Explanation:

    Given: 60 W light bulb powered by 620,000 J of energy. 20 percent efficient in converting electrical energy into light energy

    To find: how many joules of light energy does this light bulb produce each time?

    Formula: E = \frac{hc}{A}

    Solution: The total amount of energy generated by the light bulb every minute is 3600 Joules. If the light bulb is only twenty (20) percent efficient in converting that energy to visible light energy, that would be twenty percent of the total.

    E (Joules) = P (Watts)  X  t (seconds)

    E = 60 W  X  60 seconds

    E = 3600 Joules of energy

    20% of 3600 = 720 Joules

    Therefore, it produces 720 joules of light each time.

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