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I wonder if electricity consumption happen according to the Law of conservation of energy and Joule effect, in a regular circuit certain amount of energy is transformed into heat by components resistance that is composed, so result in a loss of energy.

If a superconductor has no resistance, then would be a perpetual electricity stream?

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    $\begingroup$ Relevant answer: last paragraph of physics.stackexchange.com/a/69223/154997 $\endgroup$ – user154997 Oct 22 '17 at 13:48
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    $\begingroup$ This question is pretty unclear. A current in a superconducting loop remains for ages. See e.g. en.wikipedia.org/wiki/… and references therein. Does it answer your question ? $\endgroup$ – FraSchelle Oct 22 '17 at 14:04
  • $\begingroup$ Comments are not for extended discussion; a conversation has been moved to chat. $\endgroup$ – David Z Oct 23 '17 at 5:59
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If a superconductor has no resistance, then would be a perpetual electricity stream?

To reach supperconductivity a lot of energy is needed for cooling, and as long as this is supplied there will be zero resistance, the current will follow electric circuit routes.Have a look at this .

the latest issue of the journal Nano Letters, MIT researchers present a new circuit design that could make simple superconducting devices much cheaper to manufacture. And while the circuits’ speed probably wouldn’t top that of today’s chips, they could solve the problem of reading out the results of calculations performed with Josephson junctions.

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