I think he made a good point for a remedial discussion of voltage and current; being mindful of caution around undischarged filter caps, in an audience far more likely to peek under the hood than the average person, is to me an essential disclaimer. I think his was simply a good point to add to your already superb work, and he got quite a few likes. You got many more on yours—I don’t think you were at risk of being upstaged.No, it is right for this type of video and context. Touch a high voltage source and you risk electrocution. Touch a low voltage source and you are fine. Touch a high current/low voltage source, and again, you are fine. Anyway this is a side comment so not sure how it became the core of your criticism.
This is what we are taught today.
From a medical standpoint, there are innumerable factors that contribute to the type and degree of injury when the body is exposed to electrical current. Electrical injuries are subclassified into three discrete categories—1. The direct effect that electrical current has on body tissues/organs (eg the heart); 2. Conversion of electrical energy into thermal injury (burns), and 3. Blunt mechanical injury as a result of muscular spasm (fractures, falls).From that basic point it goes that a little voltage applied directly on flesh (very low resistance) being exposed through a cut in the skin (high resistance) could certainly kill you.
Since high voltages can overcome the resistance skin have, the general idea people do remember is only high voltages are dangerous.
A paper doesn't mean much. Many get the paper just for career. I was working an intern for switch gear company. The boss said many engineer doesn't know how to repair TV, fridge.....etc it is not their interest to do such thing. They are not that curious how these stuff works. I know a repairman doesn't has any degree, he fix audiophile gear for his entire life. He doesn't need any drawing to figure out what wrong with the gear. I have studied EE too and doesn't know how to fix them. Anything wrong just change the whole PCB board. It could be just one IC chip or diode fault, but I ask the whole board change as it is under warranty. Those not under warranty just pass to repairman.A story that I have told long time ago.
I had a couple of friends from Israel when I was finished my EE degree. I was sitting with them overjoyed that this was our last semester before graduating. I noticed that they were not so happy. I asked why? They said that when they got their degree they would go home. There, people would bring them their broken TVs and Radios. Despite getting a 4 year degree, they had no idea how either worked let alone know how to repair them!
There is a massive gap between fundamentals and application. My goal with these videos is the latter.
Some of us are able to handle learning about non-binary genders and rigorous fields of academic study simultaneously—and I hardly see equanimity between learning how to respect others’ gender identities and whatever a floss dance is. Speaking as someone who provides gender affirming care as part of my position as a faculty member in infectious diseases and HIV Medicine, I am inclined to wince at that choice of example.But can you name 5 non binary genders?, can you do the floss dance? do you get Simp money?
Maybe we shuld stop the low ball boomer vs. gen-z humor.
Education and knowledge is as easily and freely available like never before in history but somehow that's not making "us" smarter
Except it is actually reality. Those graduating mostly know nothing. those going to college mostly know nothing.Some of us are able to handle learning about non-binary genders and rigorous fields of academic study simultaneously—and I hardly see equanimity between learning how to respect others’ gender identities and whatever a floss dance is. Speaking as someone who provides gender affirming care as part of my position as a faculty member in infectious diseases and HIV Medicine, I am inclined to wince at that choice of example.
This whole line of discussion, implying that students in universities today are frivolous nitwits only preoccupied with vacuous memes, compared to us rigorously pragmatic Gen Xer’s, is a larf. The EE students today are exposed to the same curriculum as they were in the eighties, plus 35 years of advancements—and those of us who were in college in the eighties/nineties have the same number of beer bong photos and memories of glow in the dark ceiling stars surrounded by clouds of weed with “The Wall” playing as college kids do today.
There’s nothing new under the sun, folks.
I agree with some of this, although I think you are speaking in absolutes ahd your perceptions are anecdotal. But my main objection to the post (and perhaps where I should have left it) was the use of learning how to treat gender non-conforming people with dignity and respect as comparable to the other inanities he invoked in his analogy. Sorry if I got carried away from there.Except it is actually reality. Those graduating mostly know nothing. those going to college mostly know nothing.
I rarely have good customer experiences anymore in my businesses. Most people are very ignorant and entitled. They think everything is free, and don't even know how to use what they are looking to purchase. Most cannot read and as such support tickets and emails are useless. They want a "step by step video tutorial" because even something as simple as opening an exe is too complicated for these people.
It has become a very slippery slope over the past years in regards to this. Most younger people can only name YT influencers and other "famous" people. They have no idea about any basic life facts, they cannot read and think for themselves.... they have no logic, no math skills, no comprehension skills, almost nothing. Most cannot use a computer, many cannot drive or don't plan to... they just want to sit around and watch netflix and video games (watching video games wasn't even a thing 10 years ago and now watching is bigger than playing itself)..... A scary world indeed.
Not to say that literally nobody knows anything, but the majority are not the ones capable of even the smallest tasks of today.
Good one!For example, a single 18650 lithium battery can provide close to 30A which is considered somewhat high current. If someone learned that it's the current that kills and it only takes 0.5A to kill you, people could be terrified of 3.7V batteries. And we certainly don't need "Danger - High Current" stickers for batteries, because there's no danger (to human bodies at least).
At first I thought the video was a bit too basic and I wanted more advanced videos, but after reading the comments here I realized Amir's video was PERFECT.
About the debate voltage vs current you need to realize that if you have to give a general advice to people who don't fully understand electricity, then you should warn them about high voltage. Professional electricians mostly care about the high voltage and that's why there are only signs like "Danger - High Voltage" and not "high current".
A good analogy is High Voltage/Current => Guns/Bullets. Nobody cares about plain bullets unless their loaded into a gun and the general advice should be stay away from guns/high voltage. Saying "it's actually the current/bullet that kills you" is way more misleading for the general public, even though it's true.
For example, a single 18650 lithium battery can provide close to 30A which is considered somewhat high current. If someone learned that it's the current that kills and it only takes 0.5A to kill you, people could be terrified of 3.7V batteries. And we certainly don't need "Danger - High Current" stickers for batteries, because there's no danger (to human bodies at least).
So, to people who criticized the video as misleading or oversimplified, I completely disagree with you. This isn't about our knowledge, but the advice we're giving to the general public. If we have to give advice to a person who doesn't fully understand the subject, we shouldn't complicate things with current, voltage, human resistance, duration, humidity, grounding, AC frequency or the resilience of electricity on different parts of the human body. I think this subject should not be restated by Amir and the effects of electricity to the human body is irrelevant to the audio community.
Just stay away from high voltage if you don't know what you're doing.
DC current tends to cause a single contraction that throws the body from the source—these injuries are most likely to lead to mechanical trauma or cardiac arrest. AC current tends to cause tetany from repetitive muscle contractions and may lead to the patient being inextricable from the source, due to a hand grasp most commonly.
Please be aware that I have made a technical article about safety tips with professional references:This isn't about our knowledge, but the advice we're giving to the general public. If we have to give advice to a person who doesn't fully understand the subject, we shouldn't complicate things with current, voltage, human resistance, duration, humidity, grounding, AC frequency or the resilience of electricity on different parts of the human body. I think this subject should not be restated by Amir and the effects of electricity to the human body is irrelevant to the audio community.
I don't recall hearing Amir saying it's the voltage that kills you (I'm not going to rewatch the video), but I think he warned about the dangers of high voltage just like I did. So if that's the case, nothing said was wrong. If Amir said "it's the voltage that kills", then yes, that would be a wrong statement. If that wasn't the case then I respectfully disagree with you and whatever comments are on youtube. Back to the gun/bullet analogy, imagine a cop seeing someone with a gun and saying "well, it could be an unloaded gun and since only bullets kill people then it might be ok".Thats exactly the way hifi myths did grow. To explain it the right way is to complicated. Explain it the easy way, even its not exactly right. Iam not a fan of things like this. Explain it the right way, or dont talk about it. And its the wrong way to say its the voltage that kills you. Yes the right way would be a littel harder to explain. But it would be the right way and not the wrong way.
Even on the yt channel there is complaining about it. So now tell that the people that complaining on yt are wrong? No they are right, that short way @amirm used is the wrong way. Its easy to give you a circuit where you can thouch 2kv absolutly save. Now you can argument in hifi devices its not that way, what armir does, thats ok. But its still wrong that the voltage kills you. Dont explain things wrong, just couse its so easy and the outcome fits the purpose. Wrong explained is wrong explained what ever the outcome is. If this would be on a xyz hifi site i would just smile. But its ASR and Amir is a EE. And thats the point where i stop to smile. Like i said 2 or 3 sentence more and it would be right.How it is, its just wrong.
Thanks, although you either misquoted me or spoke incorrectly—DC current typically causes a single muscle contraction that throws one from the source of the shock; AC current is what prevents a hand from letting go. May I ask what discipline you’re writing this technical article from?Please be aware that I have made a technical article about safety tips with professional references:
"DC tends to cause a single muscle contraction that prevents the hand from letting go of the circuit. The 50 or 60 Hz cycle of AC gives a chance to repel the hand away from the current, but the cyclical muscle contractions can be severely damaging. Currents around the let-go threshold are very painful and will help an individual with voluntarily moving the hand or other inflicted body part away immediately. A safe AC threshold for when muscle contractions are inextricable is 15.5 mA (milliamperes) for men, and 10.2 mA for women. An equivalent DC threshold is 18.13 mA for men, and 12.0 mA for women. The difference stems from the sensitivity of nervous systems and the extent of muscle development. 12 V are a safe threshold and is used for batteries. 24 VAC (volts AC) and 50 VDC (volts DC) are safe under normal, dry conditions."
Servicing Safety and Replacement of Electrolytic Capacitors
Health Hazards "The limited energy in capacitors (E = (1/2) C V²) restricts the duration of the shock, even if there are no circuit breakers to trip. The shock current will be limited by the body resistance, and the duration of the shock will be characterized by the time constant (τ = R C)...www.audiosciencereview.com
Welcome to the forum (sincerely)!At first I thought the video was a bit too basic and I wanted more advanced videos, but after reading the comments here I realized Amir's video was PERFECT.
About the debate voltage vs current you need to realize that if you have to give a general advice to people who don't fully understand electricity, then you should warn them about high voltage. Professional electricians mostly care about the high voltage and that's why there are only signs like "Danger - High Voltage" and not "high current".
A good analogy is High Voltage/Current => Guns/Bullets. Nobody cares about plain bullets unless their loaded into a gun and the general advice should be stay away from guns/high voltage. Saying "it's actually the current/bullet that kills you" is way more misleading for the general public, even though it's true.
For example, a single 18650 lithium battery can provide close to 30A which is considered somewhat high current. If someone learned that it's the current that kills and it only takes 0.5A to kill you, people could be terrified of 3.7V batteries. And we certainly don't need "Danger - High Current" stickers for batteries, because there's no danger (to human bodies at least).
So, to people who criticized the video as misleading or oversimplified, I completely disagree with you. This isn't about our knowledge, but the advice we're giving to the general public. If we have to give advice to a person who doesn't fully understand the subject, we shouldn't complicate things with current, voltage, human resistance, duration, humidity, grounding, AC frequency or the resilience of electricity on different parts of the human body. I think this subject should not be restated by Amir and the effects of electricity to the human body is irrelevant to the audio community.
Just stay away from high voltage if you don't know what you're doing.