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Onset of electrical resistance measured for first time

Using a fast-pulsing laser, physicists have recorded the first moments of electrical resistance, the friction that generates heat as electricity travels through circuits.

It’s quite the feat: electrons in a computer’s semiconductor slow from near-light speed to a snail’s pace in roughly 300 femtoseconds, or about 10,000 times faster than it takes light to travel one foot. via Wired

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