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post #81 of 107
Quote:
Originally Posted by v5v View Post

 

I =V/R.

 

By wetting both hands you've reduced resistance. Voltage remains constant so current increases.

 

Your example indicates that higher current IS the relevant factor, not power.

Read my original post.  By listing which variable changed does not change the fact that Voltage does not harm people it is Amperage that causes harm.

 

Case in point is static electricity which can regularly reach voltages of 10-20kV directly on a human body without causing harm.  It only causes mild discomfort when it discharges because there is very, very little current.

 

It's also the reason why people are know to have survived lightning strikes.  Lightning is also known to have very little current in most instances.

 

So technically, I would rather have someone with my knowledge on a jury rather than people with a complete lack of the basic fundamentals of electricity.

post #82 of 107
The other day I got a paralyzingly spasm in my left arm while using my iPad. I am guilty of multitasking though. I was also digging a piece of stuck burning toast from the toaster with a butter knife ........
post #83 of 107
Quote:
Originally Posted by Vadania View Post

Ummm.  It doesn't matter what the voltage is.  It's the current (Amperage) that usually causes fatalities.  A common personal GGCI is rated to trip at 10ma because 20ma is enough to cause fibrillation which can result in death.  It has nothing to do with the part being a "cheap knockoff" if the conditions were right.

 

The human body can actually withstand Kilovolts of electricity as long as the amperage and conditions are optimal.

 

My favorite job.

http://www.youtube.com/watch?v=6_NEAEGeFIw

 

Ummm, Voltage, amperage and resistance does matter. Amperage or voltage alone doesn't mean anything.  At 5 volts you need a lots of amperages (something like a million amp) to kill someone.  I bet the USB cable will burn way before enough currant can go thru and kill someone. 

post #84 of 107
Quote:
Originally Posted by Vadania View Post

Read my original post.  By listing which variable changed does not change the fact that Voltage does not harm people it is Amperage that causes harm.

 

After reading your post again now, I must assume I had my eyes in backwards this morning. I can't explain how I got the idea that you were arguing power over current. Apparently we agree. Sorry.

post #85 of 107
Quote:
Originally Posted by BigMac2 View Post

 

Ummm, Voltage, amperage and resistance does matter. Amperage or voltage alone doesn't mean anything.  At 5 volts you need a lots of amperages (something like a million amp) to kill someone.  I bet the USB cable will burn way before enough currant can go thru and kill someone. 

With all due respect I hope you just made that number up to exaggerate...

 

This was the first thing that came up on Google on my phone.  I'm not for believing everything on the internet, but at least it's supposedly from a University and submitted by a Council of Electrical Contractors.

 

I hope people who are pulling numbers out of thin air read this link.  I also truly hope that no one tries the car battery trick from the earlier poster that called me clueless...

 

http://www.physics.ohio-state.edu/~p616/safety/fatal_current.html

post #86 of 107
Quote:
Originally Posted by v5v View Post

 

After reading your post again now, I must assume I had my eyes in backwards this morning. I can't explain how I got the idea that you were arguing power over current. Apparently we agree. Sorry.

Thank you.  Big hugs!

post #87 of 107

I almost died when I read this story.

post #88 of 107
I'm using a cheap knock-off charger for my iPhone 4S and whenever plugged in, it usually makes the capacitive touch screen sensor not register in the right location where pressed. I have to unplug it if I want to use my phone, but some times if a call comes in I just pick it up. Now after reading this article, I'm thinking I should be more concerned.
post #89 of 107
Got to wonder if she was using an official charger or a cheap low quality Chinese knock off...
post #90 of 107
I'm surprised you guys hadn't heard about the young girl who received 2nd and 3rd degree burns from a exploding Samsung S3 phone here in Switzerland last week.





Maybe it's time for all of us to start carrying one of these with us;


Edited by Relic - 7/15/13 at 3:12pm
When I looked up "Ninjas" in Thesaurus.com, it said "Ninja's can't be found" Well played Ninjas, well played.
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When I looked up "Ninjas" in Thesaurus.com, it said "Ninja's can't be found" Well played Ninjas, well played.
Reply
post #91 of 107
Quote:
Originally Posted by BigMac2 View Post

Quote:
Originally Posted by Vadania View Post

Ummm.  It doesn't matter what the voltage is.  It's the current (Amperage) that usually causes fatalities.  A common personal GGCI is rated to trip at 10ma because 20ma is enough to cause fibrillation which can result in death.  It has nothing to do with the part being a "cheap knockoff" if the conditions were right.

 

The human body can actually withstand Kilovolts of electricity as long as the amperage and conditions are optimal.

 

My favorite job.

http://www.youtube.com/watch?v=6_NEAEGeFIw

 

Ummm, Voltage, amperage and resistance does matter. Amperage or voltage alone doesn't mean anything.  At 5 volts you need a lots of amperages (something like a million amp) to kill someone.  I bet the USB cable will burn way before enough currant can go thru and kill someone. 

 

Where on earth did you get those bizarre ideas from? It is purely current that determines lethality (although in any given system the applied voltage determines the current), and the threshold is around 50 mA but, that aside, your suggested scenario is amusing enough to explore as a thought experiment. Ignoring other breakdown effects, to drive 1 MA through a body with a resistance of at least 1 kΩ would require a voltage of 1 GV (10⁹ V), with a corresponding power dissipation (I²R) of 1 PW (10¹⁵ W). Using the heat capacity and latent heat of vaporization of a 70 kg human yields the result, at that power level, that the unfortunate subject would be entirely vaporized in approximately 0.2 microseconds. So yes - that would be fatal.

 

It is, of course, completely impossible, with any existing power source (either natural or artificial), to drive 1 MA into a resistive load of that kind. We certainly can drive even 10s of MA, but only into extemely low impedance systems.

post #92 of 107
Wet floor and a 220V outlet...and a weak heart? (Chinese homes sometimes have both because the standards haven't solidified.) I was shocked with 220 several times as a kid. Somehow I'm still posting
post #93 of 107
Quote:
Originally Posted by strobe View Post

I was shocked with 220 several times as a kid. Somehow I'm still posting

As someone raised on 120, you 220ers have some serious cojones. Giant blue arc of electricity (making noise) every time you plug something in is gutsy. 1eek.gif

Originally Posted by Marvin

The only thing more insecure than Android’s OS is its userbase.
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Originally Posted by Marvin

The only thing more insecure than Android’s OS is its userbase.
Reply
post #94 of 107
I think that's interesting. Just answering the phone is a very unlikely chance to get electrocuted, because 5V can't kill you. If the charger malfunction it could have supplied a higher voltage but this is really not likely also it would have immediately fried the phone.

Of course it's a saddening loss for the family.

Were it she answered any other than an Apple phone it probably wouldn't have made the news.

And, I live in Hong Kong and people mostly here use aftermarket chargers, I doubt all in China use original ones.
post #95 of 107
I knew this thread would devolve into equations.
Edited by Suddenly Newton - 7/15/13 at 5:47pm

"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
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"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
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post #96 of 107
Quote:
Originally Posted by Suddenly Newton View Post

I knew this thread would devolve into equations.

And that's inequitable? 1wink.gif

Originally Posted by Marvin

The only thing more insecure than Android’s OS is its userbase.
Reply

Originally Posted by Marvin

The only thing more insecure than Android’s OS is its userbase.
Reply
post #97 of 107
Quote:
Originally Posted by Relic View Post

I'm surprised you guys hadn't heard about the young girl who received 2nd and 3rd degree burns from a exploding Samsung S3 phone here in Switzerland last week.

Maybe it's time for all of us to start carrying one of these with us;

 

Clearly she was lying because her pants were on fire.

post #98 of 107
Quote:
Originally Posted by digitalclips View Post

(Note this is a side discussion regarding MBP not iPhone charger) If you are in the USA (I cannot speak to other countries' designs) , the genuine Apple one has three metal prongs to plug into the wall outlet. If you disconnect the other end from the charger you will see there is also a metal latch knob on the charger which slides into a track on the cable end. The inside of the cable's latch tracks have metal strips. On the cheap knock off I saw the latch pin was plastic not metal. I am unclear what the second cable you refer to is?

Mine is a UK type wall plug. The MBP ships with 2 plugs that connect the charger to the wall, 1 with a cord and one without. The one without the cord has an earthing pin but is not connected internally, so there is no grounding.
post #99 of 107
I have not read all posts here only up to page 2 part way down.

Now it's seems people are finding fault or issues with what has been actually reported!
All I can say that early this morning via BBC World News is that the Chinese media reported an accidental death of a stewardess
by electrocution when answering her iPhone. She was in the bath when the call came through, at her home or hotel?

They showed videos of the iPhone, it's in fact an iPhone 4S & the antenna received burning spots were her fingers were holding it.
The Chinese stated that they are looking into the charger among possibilities, Apple said it will aid completely.
The Chinese media said with the amount of counterfeit chargers was also being brought up to the attention of the authorities.

It is a shame she lost her life this way RIP & thoughts to her family and friends.
post #100 of 107
Same time in Finland:
http://www.iltasanomat.fi/kotimaa/art-1288582526949.html

13 years old boy got to a hospital over night because the iphone 5 charger flamed. The boy got electric shock and got burn on his arm.

On the picture: Superintendent Jari Tuomi from TUKES is showing the apple iphone 5 charger.

Finnish Safety and Chemical Agency (TUKES) is now investigating the charger.
www.tukes.fi/en/
post #101 of 107
also earlier on this spring, an iphone 5 charger exploded and almost burnt the house http://www.iltalehti.fi/digi/2013032016805849_du.shtml person was in sleep while the charger exploded. lucky he woke up because of the noise of the explosition.
post #102 of 107
Quote:
Originally Posted by Relic View Post

I'm surprised you guys hadn't heard about the young girl who received 2nd and 3rd degree burns from a exploding Samsung S3 phone here in Switzerland last week.





Maybe it's time for all of us to start carrying one of these with us;

That's why airlines and the TSA are getting antsier and antsier about rechargable lithium ion batteries...

post #103 of 107

So my local station has been running this headline like every hour today, unbelievable. 

 

IPHONE 5 ELECTROCUTES OWNER, LITTLE DID SHE KNOW IT WOULD BE HER LAST CALL,and other such sensational quips, and then the video goes on to fear-monger and give "tips" so as to not let your iPhone kill you.  Pretty disgusting how easily Apple gets negative PR. 

post #104 of 107
Quote:
Originally Posted by jfc1138 View Post

That's why airlines and the TSA are getting antsier and antsier about rechargable lithium ion batteries...

I hope someone eventually finds a material that allows capacitors to have similar energy density as lithium-ion. Then the stored energy wouldn't involve a chemical reaction:

http://gigaom.com/2011/03/16/tesla-ceo-id-bet-on-capacitors-over-batteries/

Much more charge cycles and safer. The only thing lacking is energy density but they should be able to sort that out with the right material:

http://spectrum.ieee.org/nanoclast/semiconductors/nanotechnology/a-new-nanorod-capacitor-has-high-energy-and-high-power-density
post #105 of 107
Quote:
Originally Posted by Marvin View Post

I hope someone eventually finds a material that allows capacitors to have similar energy density as lithium-ion. Then the stored energy wouldn't involve a chemical reaction:

 

But when you push too much juice into a capacitor it explodes like a firecracker. The bigger the capacitor, the bigger the boom. A capacitor big enough to act as a battery for a smartphone would have enough explosive power to blow off fingers and rip flesh from limbs.

 

I think I'd rather take my chances with a burning Li-Ion cell than an exploding capacitor. The former is progressive, providing at least a limited opportunity to mitigate the harm. An explosion is over before you can do anything about it.

post #106 of 107
Just read the news this morning and its clear that the cause of death was not the result of a fault in Apple's product but because she was using an iPhone charger that was a copy and not original.
post #107 of 107

It looks like another rumor site is reporting that it was a knock-off charger. Also, it was an iPhone 4.

 

They said the phone still works!?! Wouldn't that mean that the shock didn't go through the phone? I would guess so...

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