BS: Shock Risk from AA Batteries/Water?

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Liz the Squeak
Date: 11 Jan 06 - 06:46 AM

Metchosin - I have it on good authority that nothing is more painful than the jolt suffered by a male member brushing against an electric fence whilst peeing..... I cannot compare, not having a) the equipment to pee standing, b) peed anywhere near an electric fence or c) the mental incapacity to stick any part of my body on live electrical wires. Suffice it to say, it was a very long time before he was interested in gathering blackberries.

LTS












And yes.. it was even longer before I stopped laughing. Ain't I a stinker?!

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: robomatic
Date: 11 Jan 06 - 06:33 AM

When lightweight lithium batteries first came out, they could produce noxious 'gas' when overheated, as a camping instructor with a headlamp discovered when his battery vented under his parka. don't know if this is still a 'potential' (heh-heh) problem.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: GUEST
Date: 11 Jan 06 - 04:38 AM

Try touching the electric fence with your tongue (don't do it!) and the 9v battery on your bare bum for comparison.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Metchosin
Date: 11 Jan 06 - 04:29 AM

LOL....perhaps.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Amos
Date: 11 Jan 06 - 04:25 AM

A high-resistance backside, perhaps...


A

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Metchosin
Date: 11 Jan 06 - 04:04 AM

I have often deliberately tested the horseÕs electric fence with a green blade of grass to see if it was on and I have, on occasion, accidentally zapped myself on the leg of the same fence a few times and I also have some vague recollection, that once, after a bit to drink, I bushed my bare backside on an electric bear fence while squatting to take a pee.

While each provided a jolt of varying degrees, none was quite as memorable or disconcerting as zapping my tongue with a 9 volt battery. Could it be that Rapaire and I have saltier tongues than others? Or just that we are the only ones whoÕs knowledge is practical rather than theoretical, when it comes to doing dumb things?

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Paul Burke
Date: 11 Jan 06 - 03:47 AM

Amos, if you short a battery in a pool, the current will be conducted through the water by the shortest path BETWEEN THE BATTERY TERMINALS. So (alkaline) batteries are safe to everyone except themselves in water (a NiCad or lithium battery could explode, but there's still no danger from shock).

Mains and water must not be mixed.

Mains in the UK is usually fitted these days with an RCCB- this trips out if any leakage to earth is detected (i.e. any current out of the main circuit), normally at 30mA. This gives you an unpleasant jolt (I've experienced it several times), but no lasting ill effects, except upon the Immortal Soul as a result of the cussing that ensues.

The lethal effect of electric shock depends on the current and its duration. Although a small current can lead to cardiac disturbance, it usually doesn't unless sustained. Usually the heart recovers immediately.

In Europe, voltages below 50V are considered "safe" as far as shock is concerned (though you can still get burns from these voltages). Above that voltage, precautions as detailed in the Low Voltage Directive must be observed.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: s&r
Date: 11 Jan 06 - 03:19 AM

I should point out that jumping from an airplane wing is not generally fatal *after landing*.

Stu

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Clinton Hammond
Date: 11 Jan 06 - 02:24 AM

If ya don't wanna ruin your MP3 player, keep it away from the pool

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: JohnInKansas
Date: 11 Jan 06 - 01:42 AM

AA batteries may vary from about 1.2 to 1.5+ volts, depending on the battery type. Four AA batteries would usually be in series, giving not more than about 6 volts at the battery pack. In that configuration, there is little danger that you'd get a "shock" you could feel directly from the batteries.

As noted, a 7.5 v battery is sufficient to produce an acid taste if you place your tongue on the terminals, but should be harmless except to the extremely sensitive. Those who get an objectionable effect should try to use their tongue more in excercises that will strengthen and toughen it, instead of in mindless prattle that does the tongue no real good. (What you've recently had in your mouth can have a significant effect on your sensation.)

As it's the earpiece that's actually connected to the body, it matters less what the batteries can do. The "player" can convert battery voltage to whatever is needed elsewhere in the circuit, although in cheap transistorised devices the battery voltage normally is the highest voltage needed anywhere in the circuit. Assuming 4 ohms or less for your earpiece speaker, application of sufficient voltage to destroy your hearing should not cause a "shock" hazard, so you won't die from listening to it until you walk in front of the taxi you didn't hear honking at you.

Telephones present a number of differing possibilities. A "landline" phone, with the handpiece connected to the phone base, can present 35, 50, or 70 volts in the "ring" and "busy signal" circuit. In dry conditions, it's possible to get a nasty shock from these voltages, and especially in wet places, in some bizarre circumstances, these voltages are sufficient to cause fatal effects.

RF phone handsets, where there is no cord, usually (in the US) have a battery that's not more than 12 volts, but may have an oscillator to step the voltage up to something higher for the required radio signals. Since any higher voltage is between points inside the handset, the voltages are floated with respect to the ouside world's "ground voltage" so most likely if you dunk the handset it will just short-circuit internally, without producing a shock to the user/occupant. If it's still going when you pick it up out of the water and stick it on your ear, you could get a shock sensation, but at the GHz frequencies common the current is unlikely (not impossible) for the currents to penetrate to where organic damage can occur.

Quoting rules about "this voltage/current will kill you and that voltage/current won't" can be very misleading, since the current path has a lot more to do with the organic damage than simply that there is a current. Shuffling your feet on the carpet and touching the radiator is generally quite safe, since the charge that's built up is on the surface of your body, and the discharge is across skin surfaces. Shuffling your feet on the carpet and touching someone else who's touching the radiator can - in very rare instances - be harmful to the person touched, since the same currents, applied at the single point of contact, could follow internal body paths.

Stepping off an airplane wing that's not grounded on landing has been lethal to many persons. Jumping off an airplane wing so that no simultaneous contact between airplane and ground happens at the same time has rarely been lethal, but can be very unpleasant and does have some very real potential for harm. (Voltages of 600 V and higher - to as much as 1500+ V - due to inflight static buildup are common.)

The bottom line on the cheap 4 x AA battery powered audio device is that it's unlikely to pose an electrical hazard in or around a pool, but that environment is very hard on devices of this kind. With anything electrical, the bizarre circumstance that disproves any rule should be anticipated.

John

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Amos
Date: 10 Jan 06 - 11:12 PM

By contrast with your 6 combined volts, the average house current is 110V, 60Hz alternating current. If you grab ahold of some, depending on how well you are grounded (standing in water) or not grounded (wearing rubber soles) the current may pass through you seeking its path to ground because you represent the path of least resistance.

Under these conditions with 60Hz AC, the following values apply:

1 mA        Barely perceptible
16 mA        Maximum current an average man can grasp and "let go"
20 mA        Paralysis of respiratory muscles
100 mA        Ventricular fibrillation threshold
2 Amps        Cardiac standstill and internal organ damage
15/20 Amps        Common fuse or breaker opens circuit*

A

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Bobert
Date: 10 Jan 06 - 11:09 PM

Well, me and the Wes Ginny Slide Rule once spent an all nighter on exactly this question... My couzin Rufus was going thru some tough times with Rether May and he asked me if he could kill himself with his flashligh batteries... Heck, he offered to eat 'um, that's how bad the boy was.... Hey, it was Christmas... What can you say...

So me and WGSR worked thru the night and when mornin' come 'round we hadn't figgued out no way for the poor boy to do the deed with just the batteries.... Yeah, eatin' um wouldn't have done the trick but we did offer him, Plan B... Hey, it was Christmas, gol danged it!!!

We figgued that if Rufe put the batteries back into his Coleman flashlight that it would have sufficient weight for Rufus to beat himself to death with it...

What we didn't factor in was alcohol... Now, alcohol can be man's worse enemy or best friend... Kinda like a dog... So here it was three days before Christmas and I get a call from Retha May and she's crying and all and says that Rufus is out in the Chevette with a bunch of blood on his face.... Hey whats a guy gonna do???

So I go on over and, sho nuff, Rufus got some blood on his face but most from a bloody nose he got when he passed out from the Iron City and hit the steering wheel... Well, I woke him up, took him back up the half a double-wide and me and Retha May cleaned the boy up and tucked him into the sofa...

He looked so innocent there...

Sniff, that was the best Christmas...

Ahhhh, what was the question????

Bobert

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Amos
Date: 10 Jan 06 - 11:08 PM

The lethality (as mentioned above) is from the current, not the voltage.

IF I recall correctly 20 millimps is lethal, but I could be misremembering.

If the 4 AAs discharge all at once into the pool, the water will presumably conduct the current along the path of least resistance, probably down the drain pipe or fill pipe. If you are floating in the pool, you probably won't feel it.

They have a combined total capacity of 6 volts, so to produce a current of .002 Amps, they would have to be all at once directed a long a path of 3,000 ohms, if my figures are right.
The body ranges between around 4K and 20K ohms.

A

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Bee-dubya-ell
Date: 10 Jan 06 - 10:58 PM

I dunno nothin' about batteries, but I do wanna know why Wysi jogs in the pool. Most people jog on a track and swim in a pool.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Rapparee
Date: 10 Jan 06 - 10:57 PM

You bet yer booties it gives you a shock! It was LOTS more than a sour taste. Try it and see.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Metchosin
Date: 10 Jan 06 - 10:34 PM

Waddya mean you don't get a shock! I bridged the terminals of a 9V with my tongue and I certainly got more than a sour taste. Smartened me up very quickly, it did.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: wysiwyg
Date: 10 Jan 06 - 10:24 PM

Thanks, leftydee!

~S~

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: leftydee
Date: 10 Jan 06 - 10:15 PM

It takes roughly 50 volts to pierce your skin. AA batteries are 1 1/2 volts so..... if you put 35 to 40 of these little guys in series (end to end) you could get a little poke. I did hear of a guy killing himself with a 9volt battery by wiring a pin to each terminal and then sticking himself in each index finger. I suspect that this is a crock but ........ Essentially, batteries are safe. When touching a 9 volt to your tongue you don't really feel a shock but , if the battery is good, it will taste sour. Be careful with 9volt batteries because you can ignite your pants if you put a good battery in a pocket with some change. I've done it.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: bobad
Date: 10 Jan 06 - 08:11 PM

It ain't the volts, it's the amps - I think.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Fullerton
Date: 10 Jan 06 - 07:11 PM

A 240v mains shock via water is horrible - horrible horrible.
(Shudders at memory)

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: wysiwyg
Date: 10 Jan 06 - 05:12 PM

OK, Eb, do you want to be my little sister? :~)

~S~

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Ebbie
Date: 10 Jan 06 - 05:08 PM

That's an interesting question, Susan. I look forward to the definitive answer. It even bothers me to answer the phone when I'm in the tub- and yet I've been assured that the risk is minimal.

I should do what one of my sisters did once: She was curious as to whether a rabbit would bite so she stuck her younger sister's finger into the cage. The rabbit did.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: GUEST
Date: 10 Jan 06 - 05:08 PM

It's the volts that jolt and the mills (miliamps) that kill. One of your batteries could supply sufficient current but they would not be able to force it through the resistance of your body.

You are quite safe with 4 AAs.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: wysiwyg
Date: 10 Jan 06 - 04:59 PM

So-- does it matter how many AAs? Like, 4?

~S~

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Metchosin
Date: 10 Jan 06 - 04:41 PM

Actually I learned that more recently Rapaire. I got sort of used to licking the top of AAs to see if I could squeeze a little more life out of them and one day, absent mindedly, did the same thing to a 9V...duh.....LOL

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Rapparee
Date: 10 Jan 06 - 03:56 PM

I dunno about double As (L6s to some), but I learned many years ago not to see if a 9 volt battery was dead by touching both contacts with my tongue.

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: wysiwyg
Date: 10 Jan 06 - 03:52 PM

Wireless headphones? Tell me more.

(It's a CHEAP MP3 player, like $40.)

~S~

Subject: RE: BS: Shock Risk from AA Batteries/Water?
From: Clinton Hammond
Date: 10 Jan 06 - 03:49 PM

No risk, except you stand to RUIN your mp3 player....   

get wireless headphones.... then you'll just run the risk of ruining those....

Subject: BS: Shock Risk from AA Batteries/Water?
From: wysiwyg
Date: 10 Jan 06 - 03:47 PM

LOL-- I KNOW this is a dumb question, but I was PROGRAMMED as a young child: NEVER mix electricity and water.

If the battery-operated MP3 player is at poolside (well wrapped in plastic of course), and the headphones are on my head when I jog in the pool-- am I risking harming anything except, maybe, the MP3 player?

LOL-- here's a chance for unfriendlies to give me fatal advice! :~)

~Susan