hey how do i work out how many led's i can hook up to a 9v battery that will last at least a day?
i want to link together as many blue led's on one circuit as i can
i was thinking a couple of 9v batteries and a bunch of led's together, but i dont know much about led's :)
4
answers
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Answer it!
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Sep 7, 2009. 8:41 AMANGRY_CLOUD (author)
says:
ty all :) ive been reading up loads on led's think ive got a good setup sorted, ill tell ya if it all goes wrong haha
Sep 6, 2009. 8:20 AMjj37
says:
volts*amps=watts so a 9 volt is 9*0.595=5.355 watt hours =~0.2 watts per hour for 24 hours so you want an led that will run at ~0.2 watts if you have a bigger led you could change the resistor.
two questions
1. what led do you have?
2. is the nine volt alkaline?
two questions
1. what led do you have?
2. is the nine volt alkaline?
Sep 6, 2009. 8:25 AMjj37
says:
also check out this it runs at about 0.24 watts so if you could control the voltage this would work
http://www.sparkfun.com/commerce/product_info.php?products_id=8860
http://www.sparkfun.com/commerce/product_info.php?products_id=8860
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