At 11:04 I believe the correct term is "Ventricular Fibrillation". Defibrillation is the process of shocking the heart back into rhythm. It would be nice if you can correct this.
Static electricity that you accumulate walking on a carpet on a cold day has a high voltage so it shocks you when you touch a metal doorknob, but does not kill you because the current is low….
Correction: ventricular *fibrillation*. Defibrillation is the process of restoring normal electrical activity within the heart once it's gone into v-fib (by giving a properly coordinated electric shock).
Thanks dude. Each time I see these morbid videos, I feel really lucky. Also, lucky that we got an educator like you. I work in Biotech and you are really inspiring.
When I was a small kid, I stuck scissors into an electric outlet, and experienced an electric shock. I still remember the sensation. I wonder whether I could have died that day.
At 12:25 there is a slight error. 60 Hz means 60 complete cycles per second. That is 60 positave and 60 Negative parts of the wave. Totalling the electricity starting and stopping 120 times per second.
Higher frequency AC is less likely to be lethal than DC or lower frequency AC, because of the skin effect. This tends to make current to flow more along the surface of a conductor than in its interior (because in the interior, the changing magnetic field induces reverse voltage that causes electrons to repel one another). This is why a Tesla coil doesn’t kill; most of the current stays on the skin increasing the resistance and reducing current.
Inductors used to tune the frequency at which a high powered radio transmitter operates are often hollow pipes to save weight and cost, since the current only flows on the surface.
So getting the electric chair wasn't so bad after all. Knocks you out instantly. Interesting. Now knowing this, I would choose electric chair over all other forms of execution. It actually seems the most humane, despite the horrible contortions the body is doing.
While the model of electrons moving in a straight line through the wire is useful, in reality they are moving in random directions with a relatively miniscule drift velocity caused by the electric field. Veritasium's video explains it well if you want to learn more: https://www.youtube.com/watch?v=oI_X2cMHNe0
"Rubber has a resistance of 10 -100 MOhms" Particular objects have a resistance, the way materials are measured is with resistivity. The formula for resistivity is: ρ = R(A/ℓ), resistivity equals resistance times cross-sectional area divided by length. The units of resistivity is simplified to Ohms*Meters but it is really Ohms per unit of Length per unit^2 of Cross-Sectional Area. For example, if an object had a cross-sectional area of 1 cm^2, a length of 1 cm, and a resistance of 100 ohms, that material would have a resistivity of R(A/ℓ) => 100(1/1) = 100 ohm-meters. An object of the same material with a cross-sectional area of 1 cm^2 and a length of 2 cm would have a resistance of ρ/(A/ℓ) => 100/(1/2) = 200 ohms.
"When electricity passes through your skin, the high amount of resistance generates heat" For an ideal voltage source, higher resistance actually means there is less power P = V^2/R. Hence why electrical workers wear rubber gloves. However in real life, voltage sources have a source resistance so as the load resistance becomes smaller, the power will peak then get smaller(https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem ). Adding the sponge to the prisoner's head decreases the resistance and actually results in a greater power transfer. The reason the sponge stops burns is because water has a high specific heat capacity and will reach a lower temperature than bare skin despite absorbing more energy.
"This means the current would be turning on and off 60 times per second" It would be 120 times per second. In the flickering lightbulb, the times when it is on are the peaks and troughs of the sine wave, when electrons are moving fastest in either direction. The times when it is off are the inflection points, when the electrons are still.
While it’s true you usually need more current (amps) to kill you, 1 milliamperes is enough to stop your heart, making it (although very rarely) the minimum fetal dose of electricity.
My paternal granddad was an electrician. I remember him having us four grandchildren hold hands in tandem: Grandchild #1 would touch the radiator and grandchild #4 would hold Grandpa's hand. Then with his other hand, Grandpa would insert the 'blade' of his nail clippers into the "hot" (-) hole of the nearest receptacle/outlet so we could all feel the tingly current, until grandchild #1 (usually me) chickened out and let go of the radiator pipe, which would break the circuit and the tingling would stop. Fun times! until Mom found out and all the sudden we had a different baby sitter.
That live leak reference was too real 😅. LL, Ogrish, rotten etc taught me some very valuable lessons such as, always br grounded, wear a seatbelt, don't piss off narcos, don't piss of jihadists, don't piss off neo-nazis and in general just don't piss of anyone.
Electricity is just really terrifying to me and that airport video perfectly illustrates why. It's almost completely invisible (at a low enough voltage) but it instantly grabs you and forces you to hold onto it while you are helplessly cooked from the inside. It doesn't help that seeing someone get electrocuted looks pretty horrible and unnatural. Their bodies twitch like they're possessed with no visible thing hurting them until they just drop dead. I'd honestly rather get shot please, thanks.
I witnessed a criminal ride the lighting but he deserved it, Larry Desilva 34 years old, half of his life he spent in jail and prison, brutally raped and murdered an 84 year old woman, when asked why he said "All I wanted was her G.D. money and the bitc*h gave me a hard time" ⚡She was somebody's mother, So long scumbag!
you messed up your video, on for example, in 8.39 muscle contraction, you first show contracted muscle then released, oposite than you said, think about it
Get your INFOGRAPHIC POSTERS here: https://questions4science-shop.fourthwall.com/
At 11:04 I believe the correct term is "Ventricular Fibrillation". Defibrillation is the process of shocking the heart back into rhythm.
It would be nice if you can correct this.
Great video otherwise. 🙂
Static electricity that you accumulate walking on a carpet on a cold day has a high voltage so it shocks you when you touch a metal doorknob, but does not kill you because the current is low….
Anatomy of shock waves from explosions next please
Correction: ventricular *fibrillation*. Defibrillation is the process of restoring normal electrical activity within the heart once it's gone into v-fib (by giving a properly coordinated electric shock).
Doesn't the current cause ventricular fibrillation? Not DEfibrillation
How is that humane
Thanks dude. Each time I see these morbid videos, I feel really lucky. Also, lucky that we got an educator like you. I work in Biotech and you are really inspiring.
When I was a small kid, I stuck scissors into an electric outlet, and experienced an electric shock. I still remember the sensation. I wonder whether I could have died that day.
Oh my! You don't know what you're talking about. Yes, it is the flow of current that does work. Voltage is potential. Put on your dunce cap.
At 12:25 there is a slight error. 60 Hz means 60 complete cycles per second. That is 60 positave and 60 Negative parts of the wave. Totalling the electricity starting and stopping 120 times per second.
Hold on. I'm off to the hardware store to get 12 GFCI outlets for no particular reason at all
Correction:
The term is Ventricular "Fibrillation" and not defibrillation. We doctors commonly call it as V. Fib.
Fibrillation is similar to the word vibration or irregular contraction which is not a normal contraction of heart leading to it's normal physiology.
Hence, "de-fibrillators" are machines used to stop the fibrillations or vibrations and induce contractions.
Higher frequency AC is less likely to be lethal than DC or lower frequency AC, because of the skin effect. This tends to make current to flow more along the surface of a conductor than in its interior (because in the interior, the changing magnetic field induces reverse voltage that causes electrons to repel one another). This is why a Tesla coil doesn’t kill; most of the current stays on the skin increasing the resistance and reducing current.
Inductors used to tune the frequency at which a high powered radio transmitter operates are often hollow pipes to save weight and cost, since the current only flows on the surface.
Thank you for traumatizing me with this very informative video
Do a vídeo on ozone therapy, it would be really usefull
A terrible electricity execution gone wrong is depicted in the film The Green Mile, my ohh my.
I learnt something from this. Thank you.
Well that was uh….
Gruesome
Anyone rose get serious anxiety that your muscles would just start doing this stuff for no reason?
What about when you’re Tazed? how many mA are there and how does it work?
11:07 It's called ventricular fibrillation (VF) and defibrillation is a procedure performed to stop VF
So getting the electric chair wasn't so bad after all. Knocks you out instantly. Interesting. Now knowing this, I would choose electric chair over all other forms of execution. It actually seems the most humane, despite the horrible contortions the body is doing.
A few nuances about electricity
While the model of electrons moving in a straight line through the wire is useful, in reality they are moving in random directions with a relatively miniscule drift velocity caused by the electric field. Veritasium's video explains it well if you want to learn more: https://www.youtube.com/watch?v=oI_X2cMHNe0
"Rubber has a resistance of 10 -100 MOhms"
Particular objects have a resistance, the way materials are measured is with resistivity. The formula for resistivity is: ρ = R(A/ℓ), resistivity equals resistance times cross-sectional area divided by length. The units of resistivity is simplified to Ohms*Meters but it is really Ohms per unit of Length per unit^2 of Cross-Sectional Area.
For example, if an object had a cross-sectional area of 1 cm^2, a length of 1 cm, and a resistance of 100 ohms, that material would have a resistivity of R(A/ℓ) => 100(1/1) = 100 ohm-meters. An object of the same material with a cross-sectional area of 1 cm^2 and a length of 2 cm would have a resistance of ρ/(A/ℓ) => 100/(1/2) = 200 ohms.
"When electricity passes through your skin, the high amount of resistance generates heat"
For an ideal voltage source, higher resistance actually means there is less power P = V^2/R. Hence why electrical workers wear rubber gloves. However in real life, voltage sources have a source resistance so as the load resistance becomes smaller, the power will peak then get smaller(https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem ). Adding the sponge to the prisoner's head decreases the resistance and actually results in a greater power transfer. The reason the sponge stops burns is because water has a high specific heat capacity and will reach a lower temperature than bare skin despite absorbing more energy.
"This means the current would be turning on and off 60 times per second"
It would be 120 times per second. In the flickering lightbulb, the times when it is on are the peaks and troughs of the sine wave, when electrons are moving fastest in either direction. The times when it is off are the inflection points, when the electrons are still.
While it’s true you usually need more current (amps) to kill you, 1 milliamperes is enough to stop your heart, making it (although very rarely) the minimum fetal dose of electricity.
reminds me of the green mile
No one is talking about ELECTRO BOOM
0:03 who is this guy?
Think ive seen clips of him in a lot of science videos
Could this be used for muscle training in future?
My paternal granddad was an electrician. I remember him having us four grandchildren hold hands in tandem: Grandchild #1 would touch the radiator and grandchild #4 would hold Grandpa's hand. Then with his other hand, Grandpa would insert the 'blade' of his nail clippers into the "hot" (-) hole of the nearest receptacle/outlet so we could all feel the tingly current, until grandchild #1 (usually me) chickened out and let go of the radiator pipe, which would break the circuit and the tingling would stop. Fun times! until Mom found out and all the sudden we had a different baby sitter.
I can't go to yemen
The resistor limit the current which causing voltage drop, if left floating then the voltage isn't affected
The real question is…. Was it painfull?
That live leak reference was too real 😅. LL, Ogrish, rotten etc taught me some very valuable lessons such as, always br grounded, wear a seatbelt, don't piss off narcos, don't piss of jihadists, don't piss off neo-nazis and in general just don't piss of anyone.
I just learned SO MUCH right now, I will see this video several times xD
Electricity is just really terrifying to me and that airport video perfectly illustrates why. It's almost completely invisible (at a low enough voltage) but it instantly grabs you and forces you to hold onto it while you are helplessly cooked from the inside.
It doesn't help that seeing someone get electrocuted looks pretty horrible and unnatural. Their bodies twitch like they're possessed with no visible thing hurting them until they just drop dead.
I'd honestly rather get shot please, thanks.
Ventricular FIBRILLATION you mean.
From now on if I ever had kids, I'm buying those electrical socket blockers
I witnessed a criminal ride the lighting but he deserved it, Larry Desilva 34 years old, half of his life he spent in jail and prison, brutally raped and murdered an 84 year old woman, when asked why he said "All I wanted was her G.D. money and the bitc*h gave me a hard time" ⚡She was somebody's mother, So long scumbag!
you messed up your video, on for example, in 8.39 muscle contraction, you first show contracted muscle then released, oposite than you said, think about it