# 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.

1. ### awsomecp173

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0
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 KappModeratorModerator

11,513
2,651
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.

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4. ### awsomecp173

3
0
Mar 20, 2013
Does a almost 380 Ohms resistor exist?

Does a almost 380 Ohms resistor exist?

5. ### Harald KappModeratorModerator

11,513
2,651
Nov 17, 2011
Last edited: Mar 20, 2013