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Comment: Re:Voltage != Power (Score 2) 208

by cheater512 (#46644947) Attached to: USB Reversable Cable Images Emerge

5v is so your keyboard doesn't need a voltage regulator, or if it does (for 3.3v) it can just use a cheap nasty linear regulator.

100mA at 20v to 3.3v inside a keyboard? A nice 1.7 watts of heat converting your keyboard to a gentle hand warmer.

The spec is allowing a handshake up to higher voltages and amperages, but always starting at 5v.
Although I'll never be satisfied until my laptop charges from USB. Spec says 100 watt and my laptop only needs about 70 watt.

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