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Is there any way of powering a light-bulb with usb? Answered

Could you connect a usb cable to a light socket...? or would usb not provide enough power..? 

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nazmo76
nazmo76

5 years ago

A computer USB port is designed to provide 5V 500mA, some AC to USB wall warts can supply up to a few amps.

If you want to test, it's risk-free, just get a USB cable and cut it then you will see the 4 wires, keep the RED and BLACK and plug the cable on a cheap wall wart that you don't care about (in case you short it accidentally and that you are very unlucky):

there you have your 5V DC, 500mA.

For a few leds, no problem (just use appropriates Resistors, I'd say 100Ω for a typical white LED), if you want to put more than one LED, use the parallel configuration (with a resistor for each led), there is plenty of data about that on the internet.

A bit of data:

http://pinouts.ru/visual/USB.jpg

http://ledcalc.com/

https://learn.adafruit.com/system/assets/assets/00...

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Downunder35m
Downunder35m

5 years ago

Are you talking about main power or a plug in LED lamp designed for USB?
If you mean a normal light bulb as used in most homes then next time check the label ;)

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caitlinsdad
caitlinsdad

5 years ago

Look up the specs to see how many volts and current(milliamps) the typical USB port can provide. Does it match up to the requirements of your light bulb?