This is the person later after surgery with the bandage on the right hand looking at the same type of amplifier that almost killed him.I would guess it depends on the type and power of the voltage source and how the all tissue in the current path handle the thermal energy generated.
I've seen the effects of a high voltage/hgh power DC and RF burn from the finger tips to the forearm on a person repairing a 2-30MHz tube amplifier at full power. There was a cauterized to carbon interior channel following the veins and arteries (I don't remember seeing any blood flowing from the burns, only rancid smelling smoke) to the exit point of the forearm and very extensive arc damage to the tissue from the thumb, palm entry point and forearm exit point. It was his good luck we had a surgical team on-board for the Marines as they saved arm with most of the hand function after we made sure he was alive and stable after the shock.
The veins and arteries don't have zero impedance so some of the current flow is also in connecting tissue because there is an electric potential across all the body mass just like a parallel resistor circuit.Circuits involving thermionic valves are dangerous with their high voltage even the battery powered ones have high voltage.
They are also large due to transformers and the tubes themselves are large and can climb to really high temperatures.
Which has to be veins and arteries since they are uniform structures filled conductive medium and they interconnect forming a circuit depending on the electrode application.
This tends to be very misleading for many of the people that ask the kind of question for which this answer is offered.It's always the path of least resistance.
Even if that's true, you are making the very mistake I cautioned about in my prior post.Which has to be veins and arteries since they are uniform structures filled conductive medium and they interconnect forming a circuit depending on the electrode application.
Why? Based on what?There is a gradient not a single channel but the current gradient likely flows much more thru veins and arteries than thru other tissues.
Most of the current in the body is conducted by the electrochemical neurons and synapses of the nervous system which is one reason electrical shock is so damaging the nervous system. Without the electrical stimulation of the musculature the body cannot move. Or the sensory system or the brain or any other organ system work. It's also the reason you "freeze up" when being electrocuted. Military electrical shops used to have wooden walking canes in them to be used as a nonconductive hook to grab someone being electrocuted and pull them off the hot circuit.-Most of the current in a body is conducted by blood anyways regardless of were it is, tissues are immersed in it.
Nope. Until you have so much current that you start changing the properties of the paint, the distribution of current is independent of the amount of current.Let's take a plate of nonconductive material. On each end of the plate attach a copper bus bar. Splash the plate with semi conductive paint. In a very random fashion such that there is not an even coat of paint. Attach power and ground to the opposite bus bars and crank up the voltage. What is going to happen? I suspect at low voltage there will be somewhat even conductance across the plate, but as the voltage increases the current will seek the less resistive path? Until it incinerates that particular path and finds a new one.
The body acts as a volume conductor. The
points of current entry and exit are important
because 1) the current density will be highest nearest
these points and 2) the direction of current flow
(electric field) along excitable tissue will affect
electric shock efficacy (Reilly 1998).
When current is applied at two points on the
surface of the body only a small fraction of the total
current flows through the heart (Webster 1998).
Freiberger (1934) reported that for hand-to-feet and
foot-to-foot electrode contacts less then 8.5% and
0.4% (respectively) of the net current would travel
through the heart.
Leibovici et al. (1995) reported that current
passing through the thorax is associated with 60% of
electrocutions, whereas for current passing from leg
to leg it is 20%. These numbers do not address the
over-all (including not fatal) chances of exposure at
each geometry nor do they distinguish across
high/low voltage exposure levels. Leibovici et al.
(1995) note that though current density will be
higher across limbs (due to smaller cross sectional
area), the presence of vital organs in the torso
accounts for lethality of trans-thoracic currents (see
Mechanisms of injury).
Camps et al. (1976) concluded that for
ventricular fibrillation the most dangerous current
path is left arm-to-opposite leg; from arm-to-arm
being 60% less lethal. Bailey et al. (2001) found a
majority of victims died from current flow from
upper-to-lower extremities. In contrast, Alexander
(1941) noticed that more victims die from current
flow from upper-to-upper extremities. As noted
above, these findings would be more relevant if the
prevalence of the current exposure pathway,
including survivors, was known. The role of current
path has been examined systematically in dogs
|Thread starter||Similar threads||Forum||Replies||Date|
|8||H-Bridge has a path to ground. How ?||Analog & Mixed-Signal Design||3|
|Open vs closed magnetic path transformer for single pulse||Power Electronics||6|
|Current path||General Electronics Chat||23|
|R||Why does AC coupled OP amp circuit require a direct dc path to ground?||General Electronics Chat||2|
|S||Does electricity only follow the path of least resistance? (newbie question)||General Electronics Chat||6|
by Jake Hertz
by Luke James