# Proof of Ohm's Law [duplicate]

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I was watching MIT OCW 802 and the lecturer mentioned that Ohm's law has a proof by quantum mechanics. Can someone please explain this.

## marked as duplicate by hft, Qmechanic♦ quantum-mechanics StackExchange.ready(function() { if (StackExchange.options.isMobile) return; $('.dupe-hammer-message-hover:not(.hover-bound)').each(function() { var$hover = $(this).addClass('hover-bound'),$msg = $hover.siblings('.dupe-hammer-message');$hover.hover( function() { $hover.showInfoMessage('', { messageElement:$msg.clone().show(), transient: false, position: { my: 'bottom left', at: 'top center', offsetTop: -7 }, dismissable: false, relativeToBody: true }); }, function() { StackExchange.helpers.removeMessages(); } ); }); }); May 13 at 20:15

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• Possible duplicate of Derivation of Ohm's Law – hft May 13 at 19:48
• Possible duplicate of Derivation of Ohm's law using classical and quantum model – Thomas Fritsch May 13 at 19:49
• @hft I do not believe it is a duplicate. The other question asks for the possibility of a derivation from Maxwell's equations. This question differs greatly because the OP starts from the assumption that a derivation exists (a claim that apparently comes from a reputable source) and that it involves quantum mechanics. – S V May 13 at 19:53
• @ThomasFritsch The link to that question has no accepted answer and the question is poorly written. Also the answer contains no quantum mechanics, whereas here the OP is specifically asking for QM. – S V May 13 at 19:55
• The question/answer I link to states "This derivation, of course, involves more than just Maxwell's equation. This is properly derived in the context of non-equilibrium field theory." And you can see from the expectation values of the commutator that quantum operators are involved. @SalvadorVillarreal – hft May 13 at 19:56