Comment on This was the first result on Google

ABCDE@lemmy.world ⁨8⁩ ⁨months⁩ ago

• Norgur@fedia.io ⁨8⁩ ⁨months⁩ ago

  One running on "Volts" and another running on "Watts" is like refusing to compare two cars because one car runs on Wheels and the other running on Motors

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  • theneverfox@pawb.social ⁨8⁩ ⁨months⁩ ago

    Well, you just have to convert wheels to motors. A car runs on wheels, which is 1/4 motors. A boat runs on motors, and has one, meaning it has 4 wheels and is probably street legal!

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• XTL@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

  Almost every sentence. But funny self review and other things aside, main problems:

  “Watts… Contains.” Is a fundamental confusion on what a watt is. It’s like asking how much fast there is in a box.

  The answer has a good basic idea, but also a total comprehension failure not just pulling the numbers out of thin air, but badly describing an equation with watts on one side and watt hours on another. Both ignoring realities and getting the hypotheticals wrong.

  When they could have just said “yes, you could use a suitable inverter with a suitable battery and a fridge in some cases” or something like that.

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• LazaroFilm@lemmy.world ⁨8⁩ ⁨months⁩ ago

  Watt and volt are two different measures for electricity. Also your fridge will not work when hooked up to a car battery for many other technical reasons, including differ t voltages, and current types (AC/CD, not the band)

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  • hddsx@lemmy.ca ⁨8⁩ ⁨months⁩ ago

    That’s wrong. Watt is a measure of power and volt measures…… voltage.

    Charge (electricity) is measured in Coloumbs (sp?)

    You need a complete circuit for Watts as P=iv.

    I is current, measured in amperes

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    • Serinus@lemmy.world ⁨8⁩ ⁨months⁩ ago

      With the river analogy, Voltage = pressure, Wattage = how much water is passing, Current (Amps) is how wide the river is.

      Pressure * Width of river = Amount of water passing

      Not sure that helps with passing it through the terms and then to variables.

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      • Malfeasant@lemmy.world ⁨8⁩ ⁨months⁩ ago

        Water analogy works better with plumbing. A river, not so much. But people aren’t that much better at understanding plumbing, unfortunately…

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    • elucubra@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

      Volts measure voltage?

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      • themeatbridge@lemmy.world ⁨8⁩ ⁨months⁩ ago

        Tautologists study tautology tautologically.

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      • hddsx@lemmy.ca ⁨8⁩ ⁨months⁩ ago

        Electrical potential, IIRC

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  • Diplomjodler@feddit.de ⁨8⁩ ⁨months⁩ ago

    Unless you have an electric car that can do vehicle to load. That means that you can plug in regular household devices like your fridge.

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    • LazaroFilm@lemmy.world ⁨8⁩ ⁨months⁩ ago

      That vehicle isn’t using a traditional 12v car battery for that. Also the point t is you can’t connect a car battery to a fridge and expect it to work.

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      • CurbsTickle@lemmy.world ⁨8⁩ ⁨months⁩ ago

        [deleted]

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      • BirdyBoogleBop@lemmy.dbzer0.com ⁨8⁩ ⁨months⁩ ago

        So. The answer is yes you can. If the car is an EV with V2L. Which I am guessing is what that uncle was talking about in the post.

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      • itsnicodegallo@lemm.ee ⁨8⁩ ⁨months⁩ ago

        Not with that attitude!

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  • teegus@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

    Unless you have an EV with V2L.

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    • LazaroFilm@lemmy.world ⁨8⁩ ⁨months⁩ ago

      Sure you can use the 12v battery and convert that power but you can’t just connect a 12v battery and expect it to work.

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      • teegus@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

        You stated that you cant connect a car battery to a fridge. You said nothing in your comment about 12v. I can connect my var battery to my fridge no problem.

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      • teegus@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

        You stated that you cant connect a car battery to a fridge. You said nothing in your comment about 12v. I can connect my var battery to my fridge no problem.

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• MonkderZweite@feddit.ch ⁨8⁩ ⁨months⁩ ago

  If a wire were a water stream:

  • Volt is water pressure (fast or slow stream)

  • Ampere how much water there is in the stream

  • Watt is pressure x amount

  • Ohm (resistance) is how much obstructions are in the river

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  • ArkyonVeil@lemmy.dbzer0.com ⁨8⁩ ⁨months⁩ ago

    What a straightforward and clear way to put it, thank you kindly!

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  • Faresh@lemmy.ml ⁨8⁩ ⁨months⁩ ago

    I never got the pipe analogy. Since liquid water can’t be compressed, wouldn’t the amperes be directly proportional to the volts and to the size of the pipe, assuming there are no air bubbles? Also, supposedly resistance only reduces current, but when I think of hair in a pipe, the pressure after the obstruction would also be lower (because pressure is directly proportional to the amount of water that flows)

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    • Malfeasant@lemmy.world ⁨8⁩ ⁨months⁩ ago

      Since liquid water can’t be compressed

      Common misconception - it can, just not very much, so the volume change is tiny, and in practice, there’s usually something else in the system that is changing volume by a larger amount- like air bubbles, or if there’s anything elastic in the plumbing, it will stretch - but regardless, water absolutely can be under pressure.

      resistance only reduces current, but when I think of hair in a pipe, the pressure after the obstruction would also be lower

      You are correct, in electronics, resistance drops voltage (assuming the load is in series with the resistance). In fact, a cheap quick and dirty digital to analog converter uses a bunch of resistors to supply different voltages…

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    • drathvedro@lemm.ee ⁨8⁩ ⁨months⁩ ago

      It would be. By ohm’s law, I=V/R and R=V/I, so if V is fixed as V=1, then I=1/R, R=1/I, so it’s is effectively the same thing, just measured in reverse.

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    • Gabu@lemmy.world ⁨8⁩ ⁨months⁩ ago

      www.youtube.com/watch?v=X_crwFuPht4

      AlphaPhoenix also has other fantastic videos explaining and experimenting with all sorts of interesting things.

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    • Damage@feddit.it ⁨8⁩ ⁨months⁩ ago

      He expressed it wrong. Amperes is diameter of the pipe, how much volume (or charge) can be transferred per unit of length at a given pressure; Watt is the amount of water flowing out at the end, which depends both on pressure and diameter.

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      • Faresh@lemmy.ml ⁨8⁩ ⁨months⁩ ago

        Watt is the amount of water flowing out at the end

        Shouldn’t it instead be the sum of the kinetic energy of all water molecules that come out the other end per unit of time?

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• dmtalon@infosec.pub ⁨8⁩ ⁨months⁩ ago

  A little more technical, I don’t think your average starting battery is 100ah capacity, and most don’t rate themselves in amp hours either.

  I bought a deep cycle for my little sailboat at the local auto store and it’s around 70-80ah

  You would need an inverter to convert the batteries DC (direct current) into AC (alternating current). This will “cost” some power (watts) to convert that voltage. Your refrigerator runs on AC battery outputs DC.

  That said, it is quite common to run refrigerators on larger boats and RVs off batteries and it would certainly be possible to run your house fridge off a single car battery for a short while if you’ve got an inverter large enough to run it.

  What your not gonna do is just run out to the car, grab your battery and hook it directly to your fridge.

  Our fridge uses between 130-180 watts when running and about 2.9Kw or 2900 watts in 24 hours. Your battery most likely has under 1000 total watts til empty, and car batteries are generally not used past 50% capacity (lead acid starting battery). So figure 500 watts max (for easy math). So… 4h run time maybe.

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  • Bumblefumble@lemm.ee ⁨8⁩ ⁨months⁩ ago

    In your last paragraph, most of the places you write watts you mean watt hours. Good reminder that Wh is a bad unit, since it’s too easy to confuse with watts.

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    • dmtalon@infosec.pub ⁨8⁩ ⁨months⁩ ago

      Good catch… It was early and I was on my phone (my excuses) :)

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      • Pretzilla@lemmy.world ⁨8⁩ ⁨months⁩ ago

        It’s just the 2.9kw should be kWh. Everything else is correct.

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  • atrielienz@lemmy.world ⁨8⁩ ⁨months⁩ ago

    While it’s true that it won’t be at max capacity, I will say that batteries these days will rate themselves in amp hours. For instance usually an 800 CCA AGM battery lists itself online as 7.5 AH.

    The conversion process involves using the formula CCA = 7.2 x Ah to convert from Ah to CCA, and Ah = CCA / 7.2 to convert from CCA to Ah.

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    • dmtalon@infosec.pub ⁨8⁩ ⁨months⁩ ago

      I specifically looked at the available specs at the local auto parts stores and couldn’t find Ah details. This was about 2y ago, so maybe this value is becoming more commonplace. I know on the RV/Sailing works Ah is used pretty exclusively. My deep cycle AGM only lists CCA and reserve capacity

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      • atrielienz@lemmy.world ⁨8⁩ ⁨months⁩ ago

        With the rise in power banks and phones being rated in Amp Hours, I think this may be a recent change, and certainly one I have noticed.

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• FlyingSquid@lemmy.world ⁨8⁩ ⁨months⁩ ago

  It’s being answered authoritatively by an insurance agent.

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• r00ty@kbin.life ⁨8⁩ ⁨months⁩ ago

  I mean, the running on watts vs volts part was nonsense.

  But, did get quite close with the power calculation. Although here in the UK the average car battery seems to be around 60ah. I did see some very expensive large 105ah batteries. But they were definitely the outlier. So if you had a 100ah battery then it would be 1.2kwh with 100% efficiency.

  Also, it doesn't mention that you'd need an inverter to make the fridge run from a battery. These also have inefficiencies which would reduce the runtime on the battery.

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  • Malfeasant@lemmy.world ⁨8⁩ ⁨months⁩ ago

    These also have inefficiencies which would reduce the runtime on the battery.

    Not wrong, but the efficiency of inverters is really high, loss is just about negligible.

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  • downhomechunk@midwest.social ⁨8⁩ ⁨months⁩ ago

    Was about to say inverter until I saw your comment. I think the robot meant to call out AC vs DC.

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