electric shock

Stephen Wolstenholme wrote:

About 50 years ago when I was an apprentice TV engineer I often
"showed off" by producing a blue arc with my finger from the EHT. It
was quite safe because the current was very low.
You mean it was limited to a low value.

Years later I was
working on Ampex computer tape decks and accidentally touched a motor
servo drive. That was a releatively low voltage but high current - I
almost did a somersault!
You mean a high current was available if Ohm's law would allow it to pass.

Bill

Martin wrote:

Have you thought of jumping off a Wheatstone Bridge?

He'd be carried away by the current.

--
SteveT

On Sun, 20 May 2012 04:31:04 +0100, Bill Wright
wrote:

Stephen Wolstenholme wrote:

About 50 years ago when I was an apprentice TV engineer I often
"showed off" by producing a blue arc with my finger from the EHT. It
was quite safe because the current was very low.
You mean it was limited to a low value.

Years later I was
working on Ampex computer tape decks and accidentally touched a motor
servo drive. That was a releatively low voltage but high current - I
almost did a somersault!
You mean a high current was available if Ohm's law would allow it to pass.

Bill

Black & white TV EHT was about 16,000V but the current available was
very low. I would never try the same trick on a colour TV because they
had a lot more available current. The servo drive I accidentally
touched was only a few hundred volts and could deliver enough current
to kill me but I survived!

Steve

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On Sun, 20 May 2012 10:57:19 +0200, Martin wrote:

I had electrotherapy on my leg muscles after breaking it. As far as I
could tell it was a complete waste of time.

I also found it is a waste or time. About ten years ago my leg muscles
started to weaken as my MS got worse. I was sent for weekly
electrotherapy. If it did anything I didn't notice.

Steve

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On Sun, 20 May 2012 11:33:17 +0100, Steve Thackery wrote:

Have you thought of jumping off a Wheatstone Bridge?

He'd be carried away by the current.

Not if he kept his balance.

On Sun, 20 May 2012 04:25:20 +0100, Bill Wright
wrote:

Ian Jackson wrote:
In message , Bill Wright
writes
Richard Tobin wrote:
In article ,
Bill Wright wrote:
The individual cycles can be felt quite clearly. It made me wonder
if the feeling of touch has less persistence than vision. Of course
the ears would turn the 50Hz into a note.
Presumably you feel it as 100Hz, since all you can detect is the
magnitude.
-- Richard

I have very bad skin. It only conducts one way.

You ought to see a dermatologist and see if he can rectify the problem.
Oh God here we go....
OK. "I have considerable resistance to the idea."

Bill
Don't blaspheme say
Ohm Igod

--
Graham.
%Profound_observation%

On Sun, 20 May 2012 16:29:08 +0200, Martin wrote:

On Sun, 20 May 2012 12:57:43 +0100, Stephen Wolstenholme
wrote:

On Sun, 20 May 2012 10:57:19 +0200, Martin wrote:

I had electrotherapy on my leg muscles after breaking it. As far as I
could tell it was a complete waste of time.

I also found it is a waste or time. About ten years ago my leg muscles
started to weaken as my MS got worse. I was sent for weekly
electrotherapy. If it did anything I didn't notice.

A close relative, who is a physio was diagnosed with MS a year ago. I
think that in the physio world there is quack treatment mixed up with
useful stuff.

The physio who comes to sort my legs out once a month is a specialist.
She helps me a lot but I have fallen for quack treatment as well.

I have similar problems caused by post polio syndrome. Nerve ends stop
working as one grows older.

My ex brother in law had that problem and he was only 30.

Steve

--
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JustNN. Just Neural Networks. http://www.justnn.com

In article , Stephen
Wolstenholme scribeth thus
On Sun, 20 May 2012 16:29:08 +0200, Martin wrote:

On Sun, 20 May 2012 12:57:43 +0100, Stephen Wolstenholme
wrote:

On Sun, 20 May 2012 10:57:19 +0200, Martin wrote:

I had electrotherapy on my leg muscles after breaking it. As far as I
could tell it was a complete waste of time.

I also found it is a waste or time. About ten years ago my leg muscles
started to weaken as my MS got worse. I was sent for weekly
electrotherapy. If it did anything I didn't notice.

A close relative, who is a physio was diagnosed with MS a year ago. I
think that in the physio world there is quack treatment mixed up with
useful stuff.

The physio who comes to sort my legs out once a month is a specialist.
She helps me a lot but I have fallen for quack treatment as well.

Sympathies on that one!. And Heres me moaning about a bit of hip pain
and the joint that clicks a bit, but at least I can have it replaced..

This new MS drug going to be of much use do you know?..





I have similar problems caused by post polio syndrome. Nerve ends stop
working as one grows older.

My ex brother in law had that problem and he was only 30.

Steve


--
Tony Sayer

In article , Brian Gaff
scribeth thus
I suppose its an electrostatic effect, similar to the ones you can get on
double insulated mains gears metal parts if there is no earth.

No, not electrostatic just good old fashioned current leccy...


Mind you there must over a long run be quite a loss of power.
No wonder they are talking about using superconductive links at DC in the
future.


Here now .. IIRC the new link from Scotland to North Wales is DC. Losses
at AC are too great it seems;!..

Brian


--
Tony Sayer

On Sun, 20 May 2012 18:47:46 +0100, tony sayer
wrote:

In article , Brian Gaff
scribeth thus
I suppose its an electrostatic effect, similar to the ones you can get on
double insulated mains gears metal parts if there is no earth.

No, not electrostatic just good old fashioned current leccy...


Smilly noted, my old physics teacher seemed to think they were
entirely different phenomenon.

Mind you there must over a long run be quite a loss of power.
No wonder they are talking about using superconductive links at DC in the
future.


Here now .. IIRC the new link from Scotland to North Wales is DC. Losses
at AC are too great it seems;!..

Thomas's revenge.



--
Graham.
%Profound_observation%