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How much voltage and current can I power 5 white leds from a 9 volt battery?

Discussion in 'Power Electronics' started by awsomecp173, Mar 20, 2013.

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  1. awsomecp173

    awsomecp173

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    Mar 20, 2013
    How much voltage and current can I power 5 white leds from a 9 volt battery?
     
    Last edited by a moderator: Mar 20, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    No 1: Please dont shout (use standard text style).

    No 2: The voltage is, of course, 9V. The current you can draw from a typical 9V battery should be less than 500mA.

    The typical capacity of a 9V block is around 500mAh. If you drain xmA of current, the battery will last approximately 500mAh/xmA. Note that the voltage will drop when the end of life is nearing (battery nearly drained).

    Should you draw more than ~500mA from such a battery, you'll have to take into account the internal voltage drop of the battery which is due to the limited current generating capability of the battery's chemistry.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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  4. awsomecp173

    awsomecp173

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    Mar 20, 2013
    Does a almost 380 Ohms resistor exist?

    Does a almost 380 Ohms resistor exist?
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
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    Nov 17, 2011
    Last edited: Mar 20, 2013
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