Re: Newbie - Voltage - shock of 9v battery vs. 12v car battery


<jpopelish@xxxxxxxx> wrote in message
news:1130859529.480046.155460@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> hdjim69 wrote:
>> I have worked on my car and have, though my own carelessness forgotten
>> to disconnect one of the terminals and have been shocked. I have also
>> taken a new 9v battery and have touched it to my tongue. I can tell
>> you first hand there is a big difference. I guess that is why we've
>> all heard stories of prisoners being tortured using 12v car batteries
>> and not 9v toy batteries. Why is the intensity so different ?
>
> I have handled 12 volt lead acid batteries many times and never felt a
> thing. I admit that I have not bridged 12 volts with my tongue. Is
> this the only kind of shock you are describing, or are you talking
> about being shocked through dry skin?
>
> The shock sensation goes up dramatically with voltage, but my threshold
> of sensation is around 30 or 40 volts, unless I pierce my skin with a
> sharp point or edge, so the current doesn't have to pass through skin
> resistance (which is most of body resistance). If a wrench slips and
> you skin your knuckles, I guess you might feel 12 volts.
>
> An automobile also contains an ignition system that pumps the battery
> voltage up to thousands of volts, and that *will* give you a dangerous
> and painful shock.
>

You do have resistance.

When current flows through your tissue, muscles contract and become more
conductive, more current flows, muscles contract, more current flows etc
etc. (grab the two probe of an ohm meter on a high Megohm range and flex you
muscles)

the higher the voltage the more violent that initial contraction will be.

Ohms law can be use to calculate the initial current V/R=I

What you feel is power(Watts), a product of both voltage and current (amps)

P=V*I




.

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