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I am not an expert in thermodynamics but I think the following is reasonable: When heat flows from A to B (temperature $T_a$ and $T_b$) then you could theoretically do work - efficiency given by the ratio of temperatures. A Peltier is an inefficient heat engine running in reverse (a heat pump), and I thought the efficiency is the ratio between the work ...


As I recall some models of Samsung phones display the same message but many phones don't. My Nexus 5 does not and my LG tablet does not. Modern phones use lithium batteries. It is important that these are not overcharged because this degrades the batteries by forming deposits of metallic lithium. However all modern phones will automatically stop charging as ...

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