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Analog computing is undergoing a resurgence
(bigthink.com)
This is a most excellent place for technology news and articles.
The highest power draw phone SoCs are about 16w at peak, but they can only sustain that for a very short time before thermal throttling, certainly not nearly an hour. If you were displaying a fully white image on the screen at full brightness at the same time 25W could be possible. But that's not really a realistic scenario