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Why is there an extra USB connector on USB connection cable?

By Gaurav003 ·
I have a transcend optical drive that i use for reading and writing DVDs with my laptop. The connection cable is a USB type A-B cable. However, at the Type A end there is an extra provision for another Type A connection with a very short length of cable (about 20 cm). what is this third connector for?

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Power defined

by ciarocci In reply to Why is there an extra USB ...

The manuals, and the person who said the plug provides more power are right. The way it does this is by increasing amperage. P=I*V (power equals amperage times voltage). So, if I increase either voltage OR amperage, I am increasing power. Saying "Not more power, more current" is an incorrect statement, as supplying more current IS supplying more power, as well as supplying more voltage IS supplying more power. Increasing either one will give you more power.

Please refer to the wikipedia link about power. It explains this in detail.

http://en.wikipedia.org/wiki/Power_(physics)

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extra usb plug

by rmixon In reply to Why is there an extra USB ...
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Reponse To Answer

by Chas55 In reply to extra usb plug

That's fine if the device came with a F.M. :)

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