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The electrical resistance corresponding to operating at the fundamental
unit of conductance is 0.5*h/e^2, or 13000 ohms. Practical room
temperature voltage shouldn't go below 0.25 V (or 10*kT) for a single
switch. This means a single quantized conductor (like a nanowire)
hooked up across this voltage would dissipate at least V^2/R=4.8
micro-Watt. A billion of these conducting currents (in parallel) would
add up to 4.8 kW!
Obviously by increasing the wire cross-sectional area, this resistance
will go down. And also obviously, by putting many of these quantized
conductors in series across the same voltage difference, the power
consumption would go down (higher resistance, less current).
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