I was thinking about producing energy from heat and I realized that all the methods I know require a heat gradient. Is there a deeper physical explanation as to why heat gradients are needed? Otherwise, do you know of any heat to electricity generator that doesn't need a heat gradient?
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Your intuition is correct, but you should do your own research before asking others. – safesphere Jul 28 '18 at 15:53
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To add to @safesphere's comment, the key search term is '2nd law of thermodynamics' – By Symmetry Jul 28 '18 at 15:57
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1See also Extracting heat energy without a heat engine and Can you extract energy from "hot" things without a temperature differential? – sammy gerbil Jul 28 '18 at 16:25