What speed do they mean when they talk about the speed of propagation of an electric current in a conductor?

The speed of light in a vacuum has a value of 300,000 km / s, the same speed of propagation of an electric current in a conductor.
In other words, when they talk about the speed of propagation of an electric current in a conductor, they mean the value of 300,000 km / s, and this is the speed of propagation of an electric field along the entire length of the conductor.



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