Flipping a bit from 1 to 0 releases heat (because you can't just drop the 1 onto the negative/ground)

Resistance in non-super- conductors wastes electricity as heat.

From "Thermodynamics of Computation Wiki" (2018) https://news.ycombinator.com/item?id=18146854 :

> "Quantum knowledge cools computers: New understanding of entropy" (2011) https://www.sciencedaily.com/releases/2011/06/110601134300.h...

>> The new study revisits Landauer's principle for cases when the values of the bits to be deleted may be known. (with QC)