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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
tech-king

Reply 12 years ago

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
gimmelotsarobots

12 years ago

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
tech-king

12 years ago

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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killerjackalope
killerjackalope

Reply 12 years ago

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
killerjackalope

12 years ago

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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killerjackalope
killerjackalope

Reply 12 years ago

Thanks I was having a durr moment...

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guyfrom7up
guyfrom7up

Reply 12 years ago

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

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allstarn07
allstarn07

12 years ago

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
guyfrom7up

Reply 12 years ago

ake sure you don't short it out!