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battery life Answered

any one know about how long 4 double a's wired in series will last with a 200 milliamp load, here is what the online LED calculator said, I'm working on putting this in a small flashlight:

Solution 0: 1 x 2 array uses 2 LEDs exactly
+----|>|---/\/\/----+ R = 27 ohms
+----|>|---/\/\/----+ R = 27 ohms

The wizard says: In solution 0:
each 27 ohm resistor dissipates 270 mW
the wizard says the color code for 27 is red violet black
the wizard thinks ½W resistors are needed for your application
together, all resistors dissipate 540 mW
together, the diodes dissipate 700 mW
total power dissipated by the array is 1240 mW
the array draws current of 200 mA from the source.



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12 years ago

bump well a AA has about 2000 mah of life... I think