6 ms·

It's terrible how little basic electronic safety is practiced in virtually all of these videos. When we handled high amps in university, we had 3 hours of lectu

by elif 4y ago

It's terrible how little basic electronic safety is practiced in virtually all of these videos. When we handled high amps in university, we had 3 hours of lecture first simply explaining safety precautions and how to handle accidents. Not to mention, the burnt wood looks so gaudy and uninteresting. I would hardly call it fractal as it only goes 2-3 levels usually, and artistically doesn't usually make sense on furniture etc.

api 4y ago
Wait until more DIY EV servicing videos start appearing. If you short something across a decent size EV battery it will be converted into plasma and deposited on your face.
- ngvrnd 4y ago
  where your face recently was.
- xxs 4y ago
  EV is DC, and DC sparks are a thing of beauty as they lack self-extinguishing properties unlike AC sparks.
  - cuteboy19 4y ago
    why is that? I couldn't find any info about this
    - kragen 4y ago
      50Hz AC drops to zero volts 100 times a second, which makes the arc easier to extinguish. "Self-extinguishing" is a deadly exaggeration, though, as you know if you've ever seen a high-tension line being connected or disconnected. Arcs are only self-extinguishing when they deplete their energy source or destroy what they're arcing to.
    - 1-more 4y ago
      Caveat: I'm kinda dumb and this is a Cunningham's law situation. tl;dr Because in a DC situation the current is always high so the temperature through the air is always high so the air remains a plasma and remains a good conductor the whole time. OK I = V/R is how we talk about currents. Current (I) equals the potential (V) over the resistance (R). An electrical spark is where the potential across an air gap is high enough that the air—normally a good insulator and thus a poor conductor—breaks down into plasma. In that state, the air is hot enough that the electrons that would be bound to the atomic nuclei can flow the way electrons in metal do. This means that the resistance of that air gap goes from being a high number to being a low number. In the case of a DC spark, we have a constant high potential and with the plasma state a low resistance, so I = V/R = big/small = big current. Since we are putting a high current through a conductor, the temperature of the conductor goes up, and the plasma remains a plasma. It stays a good conductor the whole time. In the case of an AC spark the AC potential goes from some big positive number of volts, to zero volts, to some big negative number of volts, to zero volts, to some big positive number…you get the idea. At some point I=V/R goes from being big/small to zero/small, which can be long enough for the air to cool off and stop being a plasma and be a bad conductor. So when V is a big (positive or negative) number again in 1/4 of the period of the signal (probably 1/60/4 = 1/240 seconds) the air might be too cool to conduct the current. Then V/R would be Big/HUGE = effectively zero current. Remember: I'm just some weirdo online. This is not advice. Don't mess around with electricity.
throwaway9870 4y ago
It probably should have been more than 3 hours given that you likely mean "voltage" not "amps". Before everyone jumps on me, "it is the amps that kill you, not voltage", I understand electricity quite well and in this context, saying something like "handling high amps in a university" is almost certainly not what was taught.
- philistine 4y ago
  Also, it's not electronic safety, its straight up electrical safety. There are no electronics in a magnetron.
  - cuteboy19 4y ago
    Even with power electronics we still say electrical safety
    - elif 4y ago
      It was a class on embedded electronics and robotics. There are more hazards in electronics than merely electrical hazards. e.g. exploding capacitors, toxic fumes, etc.
  - kragen 4y ago
    A magnetron is a vacuum tube which works by swirling space charge around. Vacuum tubes are "electronics"; the word "electronics" was originally invented to distinguish vacuum tubes (where it matters that the charges are being carried by electrons) from previous electrical devices such as relays, resistors, condensers, motors, generators, and inductors, where you can pretty much ignore the nature of the charge carriers.
  - robonerd 4y ago
    Surely the magnetron itself is an electronic device.
- raldi 4y ago
  Rather than admonishing everyone for wondering the obvious question, why not just explain your reasoning?
tantalor 4y ago
Electronic -> electrical
effingwewt 4y ago
I think the people replying to you to nitpick are missing the forest for the trees. You (and many people) have to wait until university to learn this stuff if you didn't seek it out yourself (how-to's and electives in school). This kind of knowledge should be taught at a young age to demystify it. A few hours in uni (and how many people never even go), to learn life-saving information When I did appliance repair microwaves were treated as bombs. You didn't test your components live, you always unplugged first, etc. Still walked into another tech working on one (cabinet-mounted up high), with the cover off, barely on a wobbly stove-dolly and his expensive Fluke multimeter out with leads in hand. I noticed the plug still lifted up into the cabinet so I peeked in and sure enough it was plugged in. Big red warning signs on the power cable, the covers inside and the cover outside all had warnings. Dude had been through the same training I had, and still thought it was a good idea. "I'll just stay away from the high side",he said. edit to add this microwave had an external fuse. All you had to do was unscrew it and check the fuse inside- which was bad. He hadn't had to do any of the stuff he'd done prior to my arrival. They'd had an electrical surge when the power had gone out and the fuse had caught it. This tech had been on the job longer than I. end edit Even people trained and with knowledge make mistakes and sometimes are just plain stupid. People without knowledge can be dangers to themselves and others. Texas had a rash of house explosions a few years ago from people raiding copper and power wires from empty houses with live gas lines. I think the answer is educating and many people as possible, from as young an age as possible.
- hedora 4y ago
  A friend of a friend disassembled a microwave to repair it, and accidentally put one of the radiation shields back on backwards. It ended up killing his wife (lots of cancers) a few years later. So, yeah. Don't repair microwaves. It's really not worth the $100's you'll save on a replacement.
  - Chris2048 4y ago
    How would he know the microwave was the cause?
  - Tabular-Iceberg 4y ago
1-more 4y ago
> Not to mention, the burnt wood looks so gaudy and uninteresting. I would hardly call it fractal as it only goes 2-3 levels usually, and artistically doesn't usually make sense on furniture etc. There's some point I could make about how this is the worst art anyone has ever died for in history, but we'd end up in the weeds.
- cwkoss 4y ago
  I'd be interested in trekking through those weeds. Anyone have a contender for worse deadly art?
  - 1-more 4y ago
    My weeds were a bit more like how in our current cultural moment our (US centric) romantic ideas are now their worst versions. Entrepreneurship: join an MLM or become a crypto weirdo or try to start a drop shipping business as advertised in a YouTube preroll ad; Self sustenance: make a bunch of consumer choices that mark you as an individualist while doing nothing to make yourself self sustaining; political engagement: be a shitposter or maybe become a conspiracy freak since it's mainstream now; passionate self expression: die making high effort, high risk, zero reward, looks-worse-than-woodburning-by-a-mile arts and crafts that are on top of it all incredibly cliché. At least Luis Jiménez's deadly mustang sculpture looks cool!

by elif 4y ago

api 4y ago

Wait until more DIY EV servicing videos start appearing. If you short something across a decent size EV battery it will be converted into plasma and deposited on your face.

ngvrnd 4y ago
where your face recently was.
xxs 4y ago
EV is DC, and DC sparks are a thing of beauty as they lack self-extinguishing properties unlike AC sparks.
- cuteboy19 4y ago
  why is that? I couldn't find any info about this
  - kragen 4y ago
    50Hz AC drops to zero volts 100 times a second, which makes the arc easier to extinguish. "Self-extinguishing" is a deadly exaggeration, though, as you know if you've ever seen a high-tension line being connected or disconnected. Arcs are only self-extinguishing when they deplete their energy source or destroy what they're arcing to.
  - 1-more 4y ago
    Caveat: I'm kinda dumb and this is a Cunningham's law situation. tl;dr Because in a DC situation the current is always high so the temperature through the air is always high so the air remains a plasma and remains a good conductor the whole time. OK I = V/R is how we talk about currents. Current (I) equals the potential (V) over the resistance (R). An electrical spark is where the potential across an air gap is high enough that the air—normally a good insulator and thus a poor conductor—breaks down into plasma. In that state, the air is hot enough that the electrons that would be bound to the atomic nuclei can flow the way electrons in metal do. This means that the resistance of that air gap goes from being a high number to being a low number. In the case of a DC spark, we have a constant high potential and with the plasma state a low resistance, so I = V/R = big/small = big current. Since we are putting a high current through a conductor, the temperature of the conductor goes up, and the plasma remains a plasma. It stays a good conductor the whole time. In the case of an AC spark the AC potential goes from some big positive number of volts, to zero volts, to some big negative number of volts, to zero volts, to some big positive number…you get the idea. At some point I=V/R goes from being big/small to zero/small, which can be long enough for the air to cool off and stop being a plasma and be a bad conductor. So when V is a big (positive or negative) number again in 1/4 of the period of the signal (probably 1/60/4 = 1/240 seconds) the air might be too cool to conduct the current. Then V/R would be Big/HUGE = effectively zero current. Remember: I'm just some weirdo online. This is not advice. Don't mess around with electricity.

throwaway9870 4y ago

It probably should have been more than 3 hours given that you likely mean "voltage" not "amps". Before everyone jumps on me, "it is the amps that kill you, not voltage", I understand electricity quite well and in this context, saying something like "handling high amps in a university" is almost certainly not what was taught.

philistine 4y ago
Also, it's not electronic safety, its straight up electrical safety. There are no electronics in a magnetron.
- cuteboy19 4y ago
  Even with power electronics we still say electrical safety
  - elif 4y ago
    It was a class on embedded electronics and robotics. There are more hazards in electronics than merely electrical hazards. e.g. exploding capacitors, toxic fumes, etc.
- kragen 4y ago
  A magnetron is a vacuum tube which works by swirling space charge around. Vacuum tubes are "electronics"; the word "electronics" was originally invented to distinguish vacuum tubes (where it matters that the charges are being carried by electrons) from previous electrical devices such as relays, resistors, condensers, motors, generators, and inductors, where you can pretty much ignore the nature of the charge carriers.
- robonerd 4y ago
  Surely the magnetron itself is an electronic device.
raldi 4y ago
Rather than admonishing everyone for wondering the obvious question, why not just explain your reasoning?

tantalor 4y ago

Electronic -> electrical

effingwewt 4y ago

I think the people replying to you to nitpick are missing the forest for the trees. You (and many people) have to wait until university to learn this stuff if you didn't seek it out yourself (how-to's and electives in school). This kind of knowledge should be taught at a young age to demystify it. A few hours in uni (and how many people never even go), to learn life-saving information When I did appliance repair microwaves were treated as bombs. You didn't test your components live, you always unplugged first, etc. Still walked into another tech working on one (cabinet-mounted up high), with the cover off, barely on a wobbly stove-dolly and his expensive Fluke multimeter out with leads in hand. I noticed the plug still lifted up into the cabinet so I peeked in and sure enough it was plugged in. Big red warning signs on the power cable, the covers inside and the cover outside all had warnings. Dude had been through the same training I had, and still thought it was a good idea. "I'll just stay away from the high side",he said. edit to add this microwave had an external fuse. All you had to do was unscrew it and check the fuse inside- which was bad. He hadn't had to do any of the stuff he'd done prior to my arrival. They'd had an electrical surge when the power had gone out and the fuse had caught it. This tech had been on the job longer than I. end edit Even people trained and with knowledge make mistakes and sometimes are just plain stupid. People without knowledge can be dangers to themselves and others. Texas had a rash of house explosions a few years ago from people raiding copper and power wires from empty houses with live gas lines. I think the answer is educating and many people as possible, from as young an age as possible.

hedora 4y ago
A friend of a friend disassembled a microwave to repair it, and accidentally put one of the radiation shields back on backwards. It ended up killing his wife (lots of cancers) a few years later. So, yeah. Don't repair microwaves. It's really not worth the $100's you'll save on a replacement.
- Chris2048 4y ago
  How would he know the microwave was the cause?
- Tabular-Iceberg 4y ago

1-more 4y ago

> Not to mention, the burnt wood looks so gaudy and uninteresting. I would hardly call it fractal as it only goes 2-3 levels usually, and artistically doesn't usually make sense on furniture etc. There's some point I could make about how this is the worst art anyone has ever died for in history, but we'd end up in the weeds.

cwkoss 4y ago
I'd be interested in trekking through those weeds. Anyone have a contender for worse deadly art?
- 1-more 4y ago
  My weeds were a bit more like how in our current cultural moment our (US centric) romantic ideas are now their worst versions. Entrepreneurship: join an MLM or become a crypto weirdo or try to start a drop shipping business as advertised in a YouTube preroll ad; Self sustenance: make a bunch of consumer choices that mark you as an individualist while doing nothing to make yourself self sustaining; political engagement: be a shitposter or maybe become a conspiracy freak since it's mainstream now; passionate self expression: die making high effort, high risk, zero reward, looks-worse-than-woodburning-by-a-mile arts and crafts that are on top of it all incredibly cliché. At least Luis Jiménez's deadly mustang sculpture looks cool!