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Joined 10 months ago
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Cake day: August 15th, 2024

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  • Aluminium is very commonly used. It isn’t near as good a conductor as copper, but you can easilly use more toeget results and in most cases that works fine.

    The reason we stopped using aluminimun more is it is relly tricky. when you tighten a screw the al deforms over time and so you don’t get a lasting connection. Al also corrodes to a non conductive state. Many house fires were traced to al wiring in just the few years it was common. We can mitigate all the above issuses but it takes care and so copper is preferred despite al being much cheaper.




  • 100% is the typical claimed number as it is easy to measure watts of electric in and find that is exactly equal to watts of heat out - or if not the difference is easially explained by measurement error. There is no hypothesis (much less theory!) of where the energy could go it it isn’t heat and conservation of energy is enough to also decide 100% efficient.

    The above isn’t the whole story though. If you could somehow measure watts from the power plant output you would discover that 4-12% (depending on a bunch of factors) of the energy is lost before it even gets to your house and so your efficiency goes down. If you measure fuel into the power plant, those range for 10% (old systems from the 1920s only run in emergencies) to 60% (combined cycle power plants) - I’m not sure how you would measure wind and solar. Eventually the universe will die a heat death and 0% long term.


  • I have had to do that - so now you have heard of someone… My house was built in 1973, some of the outlets in locations I believe previous owners would have plug/unpluged often have worn out, and thus I had to replace them. (think kitchen appliances or vacuum cleaners - the same outlets I’m using all the time). There other other outlets that still work, but they don’t grip plugs as well as they should anymore and I am planning to replace. Despite the above, the vast majority of outlets I’ve replaced have been perfectly fine, but with young kids around I wanted modern TR outlets anywhere the kids are likely to be playing.