What school gets wrong about electricity
Charges drift through a wire slower than you walk, and the energy is not travelling inside the wire at all. The reel on this reached 1.7 million people who had never been told.
Kshitij Pandey
Ask anyone who passed school physics how a bulb lights up, and you get some version of the same answer. Electrons rush from the switch, through the wire, to the bulb, and the bulb glows.
Every part of that sentence is wrong except the last four words.
How fast do electrons actually move?
Slowly. Embarrassingly slowly.
In a copper wire carrying a normal household current, the average electron drifts at roughly a tenth of a millimetre per second. Not a tenth of a metre. A tenth of a millimetre.
At that speed, an electron leaving your switch would take somewhere near three hours to reach a bulb across the room. You would be sitting in the dark for the length of a film.
But the bulb lights the instant you flip the switch. So whatever is arriving, it is not the electrons that were standing at the switch.
Then what is arriving?
The field.
When you close the switch, you change the electric field around the circuit, and that change propagates outward at close to the speed of light. The energy travels in the space around the wire, not down the middle of it. The wire's job is to guide the field, the way a riverbank guides a river without being the water.
The electrons in the filament do move, and they do heat it. But they were already there. They did not travel from the switch. They were sitting in the filament the whole time, waiting to be pushed.
Why the wrong version survives
Because the wrong version is easier to draw.
A little ball moving along a line is a picture a ten-year-old can hold. A field filling the space around a conductor and carrying energy through it is not. Textbooks make a trade, and the trade is usually defensible: a simplification you can correct later beats a truth nobody can picture.
The problem is that nobody comes back to correct it. The ball-in-a-pipe picture gets laid down at twelve and is never revisited, so an adult with a physics grade still believes electrons sprint down copper.
What to do with this
If you only take one thing: the wire does not carry the energy. It steers it.
That single reframe fixes a surprising amount downstream. It explains why a transmission line loses power as heat rather than as slower electrons. It explains why the field, not the wire, is what a transformer actually couples. And it makes the next strange thing easier to accept, because you have already watched one confident school-level answer fall over.
That is usually where the interesting physics starts.