I'll add another effect - though not normally seen.

"bone effect"

Low frequency AC at 40 or below HERTZ that is - 28 was the actual
frequency
the (AF) tunnels through a limb to the bone and travels down the marrow.
It pops out at the exit point - burning the blood generation cells up.

This is one reason it wasn't used on Ships. To many demonstrations
led to the ban. My Dad doesn't have marrow in his right forearm.

He was bumped into a generator and broke his fall with his arm...

He was into Ship and Air borne Radar - circa 194x in a Western Electric
plant. I think the reason for 400 Hz in airplane is small
transformers/inductors.
Ships needed ballast anyway - and it was felt (likely true - never
thought to much)
that lower frequency was more efficient or something. Guess they stuck
with
60 cycles/sec - Hz - like the ground forces.

Martin
--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder


Don Foreman wrote:

On Mon, 01 Sep 2003 21:17:45 -0700, Jim Stewart
wrote:

What keeps you from getting a nasty shock from the high freqency?

"Skin effect".

High frequency AC at megahertz frequencies (RF) does not travel "thru"
conductors except at and near the surface. If you are the
conductor, it travels on your skin but not thru the bulk of your
body. The result is more like a burn than a shock. The HF in a TIG
welder is very low power. When (not if) you get "bit" it's annoying
enough to motivate you to wear gloves, but it doesn't jolt you like a
sparkplug wire does.