[time-nuts] Line Voltage frequency Interface morphed to batteries

J. L. Trantham jltran at att.net
Mon Nov 28 23:55:06 EST 2011


If you look at the frequency dependence of the 'fibrillation threshold' (the
minimum energy needed to induce ventricular fibrillation), it turns out that
60 Hz is just about optimum.

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of J. Forster
Sent: Monday, November 28, 2011 10:41 PM
To: Chris Albertson
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to
batteries

> Another pathological example is the implanted pacemaker.  How much
> voltage does it use.  I bet way less then what's inside a 9V battery.
> But the location and the firm contact it makes means very little
> voltage is required.

Maybe. I'd guess a 5-40 V pulse.

The 48V "battery" in  POTS phone systems can kill, I believe, especially
if the person's hands are wet and salty.

> One of the odd things about humans is that compared to other animals
> we are very tolerant of electrocution.

The resistance of dry skin limits the current greatly.

-John

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