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LED science fair question

Discussion in 'LEDs and Optoelectronics' started by hsp, Feb 3, 2014.

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  1. hsp

    hsp

    1
    0
    Feb 3, 2014
    We are doing the old fruit cell battery science fair experiment. Our fruit is generating 1.54V. How is it possible that we are able to power an LED that is 2.4V, 20mA? Granted, it is only emitting a faint light, but it seems to us that it shouldn't work at all. Please help this mama.
     
  2. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    2.4V and 20mA is just one point on the I/V curve of the LED. It will draw less current at lower voltages and more current at higher voltages.

    Bob
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    What would happen if you had 2 pieces of fruit?

    Could you connect them in such a way that the voltages were added together?
     
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