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Volts from an USB cable Answered

I need to know how many volts a usb cable provides from a laptop. I couldnt find any information on google and I know that someone here has to know.

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tech-king (author)Yerboogieman2008-04-30

thats only if the chip you power requests power from the port through the data cables. otherwise, you only get 100 ma

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gimmelotsarobots (author)2008-04-27

The two main voltages in a computer are 12V and 5V. In the case of a USB port it is 5V. Perfect for most projects.

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tech-king (author)2008-04-25

hang on a sec. dont start yet because: unrequested, you can only get 100ma from a usb port. requested, you can get 500ma. exceed the limits, and either the main board fries or the port gets shutdown. also, you will find a bare wire (sheild) and a string (feed cord)

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wingman246 (author)2008-04-23
user

not all cables are shielded... Which is handy for dumb projects, any constant data stream ones and the like of camera ones tend to be though.

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killerjackalope (author)2008-04-23

The red and black wires are a 5 volt line, the other two are data cables, red - positive, black - negative, green - data, I cant remember the other colour It might be blue, it's data aswell.

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user

Thanks I was having a durr moment...

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guyfrom7up (author)littlechef372008-04-23

it also depends on the cable, standard, yes, but really cheap ones don't follow any code.

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allstarn07 (author)2008-04-23

Thanks, I posted this and within 10 minutes there was an answer. Now wish me luck I don't blow up my house :P

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guyfrom7up (author)allstarn072008-04-23

ake sure you don't short it out!

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