© 2026 David R. Young — Spectrum Energy Research Foundation · CC BY-NC-SA 4.0
We use electricity constantly, yet the ordinary picture of it is muddled: electrons are said to "flow" from the power plant to the lamp, as though they travel the length of the wire. They do not. The electrons at the lamp are already there, waiting in the wire, not in motion. The moment the switch flips, they move. What reached them, at nearly the speed of light, to make that happen? And what did it travel through? This note follows those questions step by step — past the easy answers — to a clean definition built on what can be watched and measured.
Begin with two facts that are easy to confirm and hard to reconcile.
First: when you flip a switch, the lamp lights at once. The signal reaches the far end of the wire at nearly the speed of light.
Second: the electrons in the wire barely move. Drive a typical current through copper and each electron drifts only a small distance before the alternating push reverses it — on the order of a few thousand atoms each way, never the length of the wire. Their fastest natural speed inside the metal is about two hundred times slower than the signal.
So the thing that arrives instantly is not the electrons. They are far too slow. Watch the two numbers side by side and the conclusion arrives on its own: whatever races down the wire is not the electrons traveling. It is something else, and the electrons only respond to it.
Call that something the push. Start by watching it where nothing flows at all: connect a generator with no load — an open circuit — and a voltage still appears at the terminals. The push is present even though nothing flows. This tells us the push is one thing and the flow is another. Close the circuit and the push drives the electrons that were already there into motion.
Nothing is shipped from the generator to the lamp. The wire is already full of electrons, end to end, before anything happens — the way a pipe is already full of water. You do not send new water down a full pipe; you push the column that is already in it, and the far end moves at once. The electrons are the water. The push is what travels.
A push that travels through a full medium while the medium itself barely moves is a familiar thing. Drop a stone in a pond and a ripple races outward while the water only bobs in place. Sound is the same: the air carries the wave, but each molecule only shivers back and forth. These are force waves — disturbances that carry a push through a medium without carrying the medium along.
Electricity belongs to this family: it is a force wave. But it cannot be a mechanical force wave like the ripple or the sound, and the reason is the speed. A mechanical wave travels at the speed of sound in its medium — about 1,500 m/s in water, 5,000 m/s in steel. In a conductor, loose electrons from each atom's outer shell drift freely among the atoms — this is called the electron sea, and it is the electric field of electricity. A disturbance pushed through that sea, electron shoving electron, would travel at the sea's own speed — and the fastest the electrons themselves naturally move is under one percent of the speed of light. That is still well over a hundred times too slow to be the signal. Each electron also carries a small magnet at its core — the source of its electromagnetic nature. A disturbance passed from one of these tiny magnets to the next, a tilting handed down the line, is slower still. No mechanical wave through the electrons can move at the speed we measure.
But the carrier does ride the wire. Bend a conductor into any shape and the signal follows every curve. If the carrier traveled through some other medium — the quantum field that carries radio and light through open space, for instance — it would fly straight at a bend instead of following the turn. It stays with the wire because it rides the wire's own structure: the lattice of atoms, from the nucleus through the bound electrons up to the paired electrons in the shell next to the outer one. The free outer-shell electrons are not the medium — they are the responders. The lattice is the medium.
There is a second piece of evidence. When copper solidifies, it forms patches of crystal called grains, each with its own lattice alignment. Where two grains meet, the lattice shifts direction slightly. If the force wave did not ride the lattice, these small misalignments would be invisible to it. But they are not — each grain boundary adds a measurable increase in resistance. The wave notices when the lattice shifts orientation.
As the force wave rides the lattice, it shows two characteristics at once, and the two cannot be pulled apart. One is electric — a push on charge. The other is magnetic — a stress on the paired electrons in the lattice, which tilt slightly as the wave passes. That tilting is what creates the magnetic field measured on the outside of the wire.
Hold a compass beside a wire and start the current, and the needle swings at once. The magnetic disturbance appears the instant the push does, and there is no way to produce the one without the other. Two individual characteristics, always arriving together — this pairing is what brought on the term electro-magnetic.
The strength of the wave at any point is its amplitude — the size of the push it delivers there. Increase the flux and the amplitude rises; the push grows; the electrons move farther. Increase it enough and the wire melts — the force overwhelms the lattice. Amplitude is the "how hard." It is the force.
As the wave passes each point along the wire, its two characteristics meet the electrons waiting there, and each one produces its own response.
Watch the free electrons first. In a metal like copper, each atom gives up an electron from its outer shell, and these drift together as a sea among the atoms — the familiar conductor electron everyone learns about. The electric characteristic pushes on their charge, and they move. That motion is the current, and it is the response that does the work at the far end.
Now look one shell deeper, where another set of electrons plays a role. These sit in pairs, bound to the atom and not free to roam, and each pair carries a tiny magnetism that normally rests balanced. The magnetic characteristic cannot push their charge along, but it can tilt those tiny magnets off balance. The lattice springs them back. That tilting is the conductor's magnetic response.
Both responses happen at every point the wave reaches, and both keep pace with the wave at its own near-light speed. Look closely at why: it is not that the electrons or their tilting carry the wave forward — we already saw they are far too slow for that. It is that each one responds the instant the wave arrives. The wave sets the timing; the electrons follow. Picture a stadium wave: it circles the arena in seconds, but no one runs around the arena — each person simply stands as it reaches their seat. The pattern races; the people stay home.
So there is one carrier and two responses. The force wave rides the lattice, carrying the push. The free sea answers with motion — the current. The bound pairs answer with a tilt — the magnetism. The wave carries no charge; it organizes what is already present in the wire, delivering force point by point so the local electrons do the work where it is needed.
Electricity is an electromagnetic force wave traveling through a conductor. A changing magnetic field at the source — what is called magnetic flux — starts the wave and sets its amplitude — its strength. The wave rides the conductor's lattice at near light speed. The electrons do not travel the wire; each shifts a small distance back and forth as the wave passes, and no charge is shipped from source to load. As the wave passes each point, its electric characteristic pushes the free outer-shell electrons into motion — the current — and its magnetic characteristic stresses the paired electrons in the next shell in, tilting them slightly. That tilting creates the magnetic field measured on the outside of the wire. One carrier, two local responses, each following the wave at its own speed.
The force wave begins as a conversion. At the generator, the changing magnetic field — the flux — sweeps past the wire and strikes the bound electrons one shell in from the outer sea, in the third shell. It moves them only a very small distance, but it moves them. The lattice that anchors them springs them back. That small driven motion against the anchor is the conversion: the third-shell electrons compress, then decompress, and a force wave is born. The same thing happens when a rock hits water: the impact makes the ripple.
The lattice itself does not move. It is the base, and a base holds rather than travels; it holds the struck electrons so they can be driven and recover. The outer sea is not struck here either — it is pushed later, by the wave that follows, and that push is the current. And note what gets struck: the flux lands on the shell that carries the bound magnets — the magnetically responsive electrons. The electric and magnetic characters are joined from the first instant, which is why the wave is electro-magnetic from birth. From there the force wave rides the lattice down the wire.
Related notes: Correction 004 (the two waves in a wire; the lattice as base) and Research Note 016 (the magnetic response — the bound-pair tilting). Two items remain pending that this note touches: the rework of Correction 003 (the photon is not "one cycle"), and the Note 016 Section 6 clarification separating the sea's kinetic flow from the bound pairs' magnetic response.
© 2026 David R. Young — Spectrum Energy Research Foundation