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

[awsomecp173]

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

 

[Harald Kapp]

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.

 

[(*steve*)]

Also, read this: https://www.electronicspoint.com/got-question-driving-leds-t256849.html

 

[awsomecp173]

Does a almost 380 Ohms resistor exist?

Does a almost 380 Ohms resistor exist?

 

[Harald Kapp]

http://www.logwell.com/tech/components/resistor_values.html -> 379 Ohm

You don't need that precision for an LED series resistor. +-5% are enough.