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21 August, 04:45

How many LEDs must be combined into one light source to give a total of 3.8 W of visible-light output (comparable to the light output of a 100 W incandescent bulb) ?

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  1. 21 August, 05:07
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    This is an incomplete question. The complete question is - -

    An individual white LED (light-emitting diode) has an efficiency of 20% and uses 1.0 W of electric power.

    How many LEDs must be combined into one light source to give a total of 3.8W of visible-light output (comparable to the light output of a 100W incandescent bulb) ?

    And the answer is - -

    19 LEDs

    Explanation:

    The full form of LED is Light emitting diode.

    It is given that the efficiency of the LED bulb is 20 %

    1 LED uses power = 1 W

    So the output power of 1 LED = 0.2 W

    We need to find the power required to give a 3.8 W light.

    Power required for 3.8 W = Number of LEDs required = (total required power / power required for 1 LED)

    = 3.8 / 0.2

    = 19

    Therefore, the number of LEDs required is 19.
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