There is no single speed of electricity: an electrical signal travels through a conductor far faster than the charge carriers drift. OpenStax gives typical textbook scales of about 108 metres per second for signals and 10-4 metres per second for charge-carrier drift. These are order-of-magnitude examples, not measurements for every wire.
What does “speed of electricity” mean?
The phrase can describe two different motions in a metal wire: the propagation of an electrical signal, or the average drift of the charge carriers that make up the current. The distinction explains how an appliance can respond quickly even though individual electrons move slowly on average.
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| Meaning | What is moving | Typical scale |
|---|---|---|
| Signal propagation | A change in the electric field that spreads through the conductor and its surrounding setup | About 108 m/s, a typical textbook order of magnitude, not a value for every cable [OpenStax, section 9.2] |
| Charge-carrier drift | The carriers’ average net motion through the metal | About 10-4 m/s, a typical textbook order of magnitude [OpenStax, section 9.2] |
How can electricity move quickly if electrons drift slowly?
When a circuit is switched on, the relevant fast event is the spread of an electric-field change through the circuit—not a particular electron racing from the switch to the appliance. The electrons already present in the conductor respond locally as the change reaches them. Their slow average drift and the much faster propagation of the signal are different quantities.
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Is electricity as fast as light?
Light in free space travels at the speed of light in vacuum. A signal traveling along a conductor, however, is not automatically traveling at that vacuum speed. Its propagation depends on the medium and the electrical setup; a university-hosted explanation notes that cable signal velocity is slower than vacuum light speed. Treat the light-speed comparison as a reference, not an exact prediction for a wire.
For a specific cable, an exact signal speed requires details about the cable and its propagation conditions. The typical figure above should not be read as a measured value for household wiring, a named cable, or every circuit.
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- Used Book in Good Condition
Further reading
- OpenStax: Model of Conduction in Metals explains current, drift velocity, and electrical-signal propagation.
- OpenStax: Plane Electromagnetic Waves discusses electromagnetic-wave propagation in free space.
- Christopher S. Baird: “What is the speed of electricity?” distinguishes signal velocity from electron motion.
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