<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>ninkendo</author><text>I’m not an expert on this, but I think superconducting wires have an current limit, as a current flowing creates a magnetic field which the superconductor has to repel. I read that the paper states a very low current limit for LK-99, meaning it loses superconductivity once a very modest amount of current is passed through it.</text><parent_chain><item><author>derefr</author><text>Resistance is what makes things hot, and heat is what makes dumping huge amounts of charge current into batteries a bad idea. No resistance → no heat → no need to charge with low current†.&lt;p&gt;Another way to say it is that, with a superconducting wire, you can make the wire as thin as you want and still pass the same amount of current through it, without melting the wire. Picture using a USB-C cable to charge your car.&lt;p&gt;† (There&amp;#x27;d still be a current limit due to the heat generated by the chemical reaction that rebuilds the battery&amp;#x27;s voltage potential... if said reaction is exothermic. Some battery chemistries are endothermic when charging!)</text></item><item><author>klysm</author><text>&amp;gt; Batteries that don&amp;#x27;t take any time to recharge&lt;p&gt;Huh? Is this actually a thing that this enables? I don&amp;#x27;t initially see how</text></item><item><author>jtchang</author><text>The ramifications of the inflection point we are currently at is mind boggling. I had a hard time explaining this last night but we may very well be witnessing the beginnings of a technological transformation era much like when the p-n junction was invented. From the 1940s standpoint it would be hard to envision all we had today.&lt;p&gt;- Lossless transport of energy
- Batteries that don&amp;#x27;t take any time to recharge
- Faster CPUs. Much faster with no heat to burn your lap.&lt;p&gt;Can I have my flying car now?</text></item></parent_chain></comment><story><title>A room-temperature superconductor? New developments</title><url>https://www.science.org/content/blog-post/room-temperature-superconductor-new-developments</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Chabsff</author><text>Superconductors also have an inherent current limit above which they go back to having a resistance.</text><parent_chain><item><author>derefr</author><text>Resistance is what makes things hot, and heat is what makes dumping huge amounts of charge current into batteries a bad idea. No resistance → no heat → no need to charge with low current†.&lt;p&gt;Another way to say it is that, with a superconducting wire, you can make the wire as thin as you want and still pass the same amount of current through it, without melting the wire. Picture using a USB-C cable to charge your car.&lt;p&gt;† (There&amp;#x27;d still be a current limit due to the heat generated by the chemical reaction that rebuilds the battery&amp;#x27;s voltage potential... if said reaction is exothermic. Some battery chemistries are endothermic when charging!)</text></item><item><author>klysm</author><text>&amp;gt; Batteries that don&amp;#x27;t take any time to recharge&lt;p&gt;Huh? Is this actually a thing that this enables? I don&amp;#x27;t initially see how</text></item><item><author>jtchang</author><text>The ramifications of the inflection point we are currently at is mind boggling. I had a hard time explaining this last night but we may very well be witnessing the beginnings of a technological transformation era much like when the p-n junction was invented. From the 1940s standpoint it would be hard to envision all we had today.&lt;p&gt;- Lossless transport of energy
- Batteries that don&amp;#x27;t take any time to recharge
- Faster CPUs. Much faster with no heat to burn your lap.&lt;p&gt;Can I have my flying car now?</text></item></parent_chain></comment><story><title>A room-temperature superconductor? New developments</title><url>https://www.science.org/content/blog-post/room-temperature-superconductor-new-developments</url></story>