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[–] 88 points 9 months ago (6 children)

Ad on a DC system, the electrons move dozens of times slower than a person walking. They also don't get anywhere, and power is still delivered.

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  • [–] 53 points 9 months ago (2 children)

    It's fun to calculate that from a socket to a light bulb it may take something close to a few hours for one electron to get to the bulb, but even then that's an average. Some electrons don't even get to the light bulb ever.

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  • [–] 36 points 9 months ago (1 child)

    IMO, the more interesting thing is how they are all always moving at a large fraction of the speed of light, but over any large distance, they are that slow.

    Things never cancel each other so well on the macroscopic world.

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  • [–] 50 points 9 months ago (4 children)

    In an AC system, the pedastal fan in your bedroom is electromagnetically coupled to the turbine at the coal/gas/hydro/nuc power station. They instantly and directly influence each other, and they both are spinning in tandem like two wheels on a car connected by an axel. Slowing the rotation of the fan with your hand technically increases the torque of the turbine, if only by an immeasurably small amount.

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  • [–] 21 points 9 months ago

    Fun Fact: An improperly shielded (or old and deteriorating) fan can be influenced by stray electromagnetic radiation. They'll pick up AM radio signals occasionally, creating an off tone in the fan noise that sounds like a person talking faintly on the other side of the fan.

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  • [–] 16 points 9 months ago* (last edited 9 months ago)

    AC motors are more powerful but also more noisy. You need that power in your kitchen mixer but you need quiet in a fan. Modern WC rooms now have a DC fan, old ones have the loud one.

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  • [–] 44 points 9 months ago (4 children)

    The balls in the middle of newtons cradle don’t move either.

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  • [–] 15 points 9 months ago (2 children)

    Newton's cradle sounds like a kinky sex move, which is ironic since Newton was likely a virgin.

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  • Yeah. Sort of like holding two ends of a chain and dragging it back and forth. Even if the chain isn’t traveling the full length, it’s still moving and you could still extract power from the system if you attached something to the middle of the chain.

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  • [–] 119 points 9 months ago

    This is analogous to saying, the blades on a wind turbine don't go anywhere, they simply spin, and yet power is created.

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  • [–] 41 points 9 months ago (4 children)

    Whats crazier is that in direct current individual electrons don't travel at the speed of light through the conductor, but only at roughly 1cm/s.

    Or, that thanks to the "skin effect" the current actualy travels in a very thin layer below the outside surface of cconductor. Most of the conductor doesn't transfer power but only maintains the magnetic field to keep the current flowing.

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  • [–] -4 points 9 months ago (2 children)

    That's why you don't have one thick copper cable but multiple thin ones.

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  • [–] 34 points 9 months ago (1 child)

    why is everyone in this thread telling me to imagine something

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  • [–] 33 points 9 months ago

    imagine a bicycle chain between two sprockets, if you crank it foward and back like 1 inch, over and over again, you can clearly transmit power without the chain links going much of anywhere

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  • [+] 21 points 9 months ago (2 children)
  • [–] 19 points 9 months ago (3 children)

    The microwave doesn't heat your food, it just vibrates the water.

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  • [–] 12 points 9 months ago (2 children)

    Heat is kinetic energy and the water is part of your food, so the microwave does heat your food.

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  • [–] 16 points 9 months ago* (last edited 9 months ago) (7 children)

    Elections merely facilitate the transfer the power, like (the non-leading edges of?) a drive shaft or cogs.

    Even with DC you need a loop (well, a difference).

    Carbon fuel one-use mentality where you burn your supply (chemically stored energy) doesn't apply, tho non-rechargeable batteries make it seem so.

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  • [–] 8 points 9 months ago* (last edited 9 months ago) (2 children)

    It’s even crazier than that. It’s not even the electrons at the “leading edge” it’s the EM field they create even separate the of the wires that actually contain the electrons.

    https://youtu.be/bHIhgxav9LY

    And the follow-up with a physical experiment after the first video started a huge drama.

    https://youtu.be/oI_X2cMHNe0

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  • [–] 4 points 9 months ago

    God I hate that video, he explains everything so badly to the point of completely misinforming viewers. He's talking about a special situation of AC current, but uses DC in the thought experiment. He makes it seem as if the field travels to the load in a direct path and the wires don't matter. No, the EM field is completely based on the wire.

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  • [–] 3 points 9 months ago* (last edited 9 months ago)

    No, the leading edge of the mechanical transfer of power - I was trying to make a faux comparison that electrons would be the inside of the shaft/cog & the fields the leading edges (that transfer the power & are moving more).

    I mangled the comparison, should have given up on it. Vibes are hard to compare with anything non-vibes.

    Great youtubing in the links, that's how you get them views (benefit several creators and spread science)!
    (*I just skimmed them for the general vibe, I'm not voicing support in case they are weird ppl, I don't know them.)

    Edit: while speeding through I noticed a very cool simulation (software), yt/mcez0ri9yPY, these are very neat visuals.

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  • [–] 3 points 9 months ago* (3 children)

    non-rechargeable batteries

    Yeah, why are they still a thing? Recharchables have all the advantages but more.

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  • [–] 11 points 9 months ago (2 children)

    Low self discharge. Good for ultra low power devices like remote controls or lights only used on occasion where a rechargeable battery would self discharge faster than the rate of actual use.

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  • [–] 15 points 9 months ago (2 children)
  • [–] 26 points 9 months ago (1 child)

    when you touch something we never actually touch it is all just fields interacting all the way down

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  • [–] 13 points 9 months ago

    The voltage(electrical equivalent of force) is what travels.

    It's analagous to pushing something away from you with a really really really long stick, then pulling it back again. The stick didn't move much but you still affected something far away.

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  • [–] 10 points 9 months ago

    That movement is still energy

    Build a circuit to make use of that et voilà

    Friction makes heat. Same thing really

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  • [–] 8 points 9 months ago

    Imagine an old-timey saw with a lumberjack on each side, pulling it back and forth across the tree. The saw just goes back and forth, but effective work gets done.

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  • [–] 4 points 9 months ago

    Theres a gnarly your mom joke in here somewhere

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  • [–] 3 points 9 months ago

    Kind of like how a piston in an engine also kinda just "shakes about" (because of explosions or steam or whatever) and yet delivers a lot of power.

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  • [–] 2 points 9 months ago (9 children)
  • [–] 8 points 9 months ago (8 children)

    Fyi, it isnt fully correct and a lot of electricity related channels were a bit annoyed by it. But overal its a good video hehe

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  • [–] 5 points 9 months ago (7 children)

    Do you happen to know a good video about the issues?

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  • [–] 10 points 9 months ago* (last edited 9 months ago) (1 child)

    https://youtu.be/2Vrhk5OjBP8

    AlphaPheonix has a few amazing electricity videos including this one where he actually does the experiment.

    Veritasium's video was so bad, like 15 channels made response videos within a week. Just search for, "is veritasium wrong about electricity". It's not that he was completely wrong, he was just doing lots of hand waving and making electricity sound like voodoo.

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  • [–] 7 points 9 months ago (4 children)

    Watch mehdi electoeboom and Steve mould's follow up argument about who is right.

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  • [–] 3 points 9 months ago (2 children)

    Veritasium also made a follow-up video addressing their arguments. After that, they kind of went silent and seemingly sided with Veritasium

    https://youtu.be/oI_X2cMHNe0

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  • [–] 4 points 9 months ago*

    My main concern with his video was a lack of a real explanation. He never once used the word induction, for instance.

    The AlphaPhoenix video I linked proves Veritasium "true". It wasn't even a rebuttal, really. It's just that he had a problem with what Veritasium was saying about current and what it means to light up a light bulb.

    Just because no one made another video after Veritasium made a follow-up one, just means everyone was tired of the subject. I have not watched Veritasium's follow-up video because his first one offended me so much I blocked his channel. It's not the content that was wrong, necessarily, it was the way he presented it. It was all hand waving without trying to get people to truly understand the thought experiment. It pissed me off.

    (I just edited my original comment to change rebuttal to response. Also, I removed all the other links because I haven't watched them yet, so I can't say anything about them.)

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  • [–] 3 points 9 months ago

    He really showed only induction in that video, that everyone knew about. And a very small current only goes in the first pulse. Rest of the current flows as you would normally expect. Electroboom explained it pretty well and this video didn't really disprove or argue against that at all

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  • [–] 2 points 9 months ago (2 children)

    Yep, exactly why it works so much better over distance than DC.

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  • [–] 12 points 9 months ago (1 child)

    That's not correct. What you need for long distance is high voltage, and it's easier/cheaper to step up/down AC voltage than DC. If conversion costs were eliminated, DC is actually more efficient.

    If you get to even longer distances of over 300+ miles, DC's efficiency becomes worth the additional cost of conversion. There are many HVDC interregional connections.

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  • [–] 3 points 9 months ago

    At distances closer to a quarter wavelength you can also have some pretty gnarly reactions if a line goes down. That's why stuff like the Kahora Bassa power plant uses HVDC for transmission.

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  • [–] 1 point 9 months ago (5 children)

    Presumably the vibrating back and forth causes a net negative charge to propagate down the line?

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  • [–] 4 points 9 months ago (2 children)

    There's a neat video by smarter everyday (and a bunch of back and forths among youtubers, including electroboom) where they show it and argue about it, but the power is actually transmitted through the electrical fields 'outside' of the wires.

    Imagine a loop of electrical wire that is 300,000km long. Your switch is at point A, and the light bulb is at point b, halfway along the wire. If the energy truly 'propagated down the line' it would take half of a second for the light bulb to turn on when you flipped your switch to complete the circuit. Interestingly, if you make the loop so that points A and b are closer than the lines maximum possibility (or, in other words if you imagine the loop as a 0, the points are at the left and right of the 0 instead of the top and bottom), then the light bulb turns on based on how far apart the points are, not the distance of electrical line between them.

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  • [–] 2 points 9 months ago (1 child)

    Nah. Power is just the potential to do work. Clever electrical engineering just takes advantage of the teensy pushes and pulls to do that work. Like pushing a swing, I don't move but my kid sure can go high when I apply those pushes and pulls at the right time.

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  • [–] 1 point 9 months ago (1 child)

    So you're admitting that AI data centers vibe pretty hard? Your words!

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