If a machine is never 100% efficient transforming energy into work because part of the energy is converted into heat, does it mean an electric heater is 100% efficient? @[email protected]

  • ChonkyOwlbear@lemmy.world
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    9 months ago

    You know how you turn on an electric heater and the filament begins to glow? That is energy being converted to light, so not 100% efficient.

      • Fubber Nuckin'@lemmy.world
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        9 months ago

        I mean if you want to go that route, we could just say that every speaker, light source, motor, etc is 100% efficient at generating heat because all of its energy output will eventually become heat.

        • xigoi@lemmy.sdf.org
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          9 months ago

          That is also completely true, but meaningless because heat generation is not the purpose of these devices. However, if you use them in a building heated by a thermostat-controlled electric heater, you’re effectivhly running them for free.

          • Xatix@lemmy.world
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            9 months ago

            I‘m was using two old servers with folding@home running as space heaters in the winter. I got them for dirt cheap and thought if I convert electricity into heat, I might as well do something good with it. Also nice opportunity to run a minecraft server for the kids during that time.

          • Xatix@lemmy.world
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            9 months ago

            I‘m was using two old servers with folding@home running as space heaters in the winter. I got them for dirt cheap and thought if I convert electricity into heat, I might as well do something good with it. Also nice opportunity to run a minecraft server for the kids during that time.

        • PeterPoopshit@lemmy.world
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          9 months ago

          Energy can neither be created nor destroyed so in the grand scheme of things, everything is 100% energy efficient one way or another.

        • vynlwombat@lemmy.world
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          9 months ago

          I suggest we submit proposals to define “100%” and “efficient” before we design the experiment

      • lad@programming.dev
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        9 months ago

        The visible part of the spectrum is likely going to be absorbed somewhere far away from the place you’re trying to heat up. Also, I’m not educated enough to tell if there will be further losses of energy

        • CookieOfFortune@lemmy.world
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          9 months ago

          If it’s in a room the visible radiation will still just heat up the room. If you’re using it outdoors and point it away then yeah you’ll have some waste.

          • lad@programming.dev
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            9 months ago

            Not sure if visible radiation that leaves through a transparent window will still heat up only inside the room, that what I meant. Probably should have phrased it better

        • FiskFisk33@startrek.website
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          9 months ago

          that’s only true if you shine it out a very large the window

          normally windows cover a quite small fraction of a rooms surface area

          but sure, if a few fractions of a percent leave through a window, i guess its technically not a 100% effective space heater, if we define the work as heating only the relevant room.

      • Hamartiogonic@sopuli.xyz
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        9 months ago

        That heat also powers certain chemical reactions happening on the surface of the hot wire. It’s not a lot of energy, but it’s still something. Light and sound tend to be converted back to heat at some point, but chemical transformations can be more stable, which would result in a tiny loss of efficiency.