General > General Technical Chat
If the electrical energy is outside the wires, how is insulation protecting us?
typoknig:
--- Quote from: SiliconWizard on April 01, 2022, 10:26:19 pm ---So then, what is energy? ;D
--- End quote ---
This is the question I was hoping we would get to. I propose that we cannot get shocked unless some "energy" is being transferred to/from us. Since we don't get shocked unless we touch a bare conductor there must be some "energy" in or on the conductor. What is that "energy"? :-//
TimFox:
Birds perched directly on a single overhead wire from a utility pole do not get shocked.
The phenomenon of being "shocked" results from current flowing through the body.
In my MRI days, I spent time in very strong static magnetic fields, between 0.5 T and 20 T (5 kG to 20 kG). (The earth's magnetic field is < 1 G.)
(The common procedure was that the physicist should volunteer to be in the magnet while the engineers did the adjustments and ran the tests.)
The effect of these strong fields was evident: I once set a tweezers down on the couch and it went flying into the bore. The techs were forever finding paper clips that had been carelessly left behind.
When locating a non-ferromagnetic object (aluminum box with brass screws) near the magnet, the reaction force from eddy currents when the box was moving could be felt easily.
Besides the effect of these strong fields on ferrous object (such as surgical implants), the main safety worries were the E-field induced in the patient by the time-changing gradient magnetic fields used for imaging, and the high-frequency currents induced in the patient's conductive material (basically, saline solution) from the pulsed RF magnetic field that dissipated heat in the tissues. In extreme cases, where a defective RF coil structure focused the AC field, this could cause a burn. Of course, an extreme failure of the hardware could result in a direct connection to the patient and shock him, but this is extremely rare.
eti:
This, AGAIN? :-DD :-DD
aetherist:
--- Quote from: typoknig on April 02, 2022, 04:03:57 pm ---
--- Quote from: SiliconWizard on April 01, 2022, 10:26:19 pm ---So then, what is energy? ;D
--- End quote ---
This is the question I was hoping we would get to. I propose that we cannot get shocked unless some "energy" is being transferred to/from us. Since we don't get shocked unless we touch a bare conductor there must be some "energy" in or on the conductor. What is that "energy"? :-//
--- End quote ---
Electric energy near a wire is 3 things.
(1) It is the energy in the em radiation surrounding the wire. We don’t know what this em radiation is, but it produces an electric force (due to what we call charge), & it produces a magnetic force (a mmf). It gives us radio waves.
(2) It is the energy of the(negatively charged) elektons on the wire, ie photons hugging the wire. These elektons can produce a force directly (ie by contact), or indirectly via their em radiation. Strictly speaking there is no such thing as contact, contact is via em radiation.
(3) It is the energy of the electrons on the surface of the wire.
Forces give us energy, & energy gives us forces.
Aether gives us photons (the fundamental particle)(or quasi particle)(electrons & quarks etc being the fundamental particle if u like), & the em radiation emitted by photons. Photons etc are an excitation of aether.
Praether is the fundamental essence, & it gives us aether (an excitation of the praether).
Everything that we see & feel has mass.
Except gravity, gravity aint got no mass. Gravity is due to the acceleration of the bulk flow of aether, aether flowing into matter (where aether is annihilated).
If something annihilates aether then that something has mass, & everything annihilates aether (ie everything has mass)(except that gravity has zero mass)(unless u believe in a contractile aether, but i wont go into that).
Em radiation has mass, photons have mass, electrons & elektrons & elektons have mass, if not then we would not have electricity or elektricity or elekticity, ie we would not have electric forces, ie we would not have electric energy.
However, gravity & gravity force, & gravitational energy do not play a part in electric energy.
Someone:
--- Quote from: eti on April 02, 2022, 09:28:36 pm ---This, AGAIN? :-DD :-DD
--- End quote ---
Feels like it started off ok, but will quickly turn back into :horse:
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