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The speed at which energy or signals travel down a cable is actually the speed of the electromagnetic wave traveling along (guided by) the cable. I.e., a cable is a form of a waveguide. The propagation of the wave is affected by the interaction with the material(s) in and surrounding the cable, caused by the presence of electric charge carriers ...
Demand for electricity grows with great rapidity as a nation modernises and its economy develops. [66] The United States showed a 12% increase in demand during each year of the first three decades of the twentieth century, [67] a rate of growth that is now being experienced by emerging economies such as those of India or China. [68] [69]
I agree. This topic could be however explained more in Electricity article. Especially what is causing the electrons to convey electricity at speed of light (electromagnetic waves or collisions?!) and what is actually moving the power and where (electrons on the surface of the conductor?). --Yebbey 09:01, 11 May 2010 (UTC)
Maxwell's equations explain how these waves can physically propagate through space. The changing magnetic field creates a changing electric field through Faraday's law. In turn, that electric field creates a changing magnetic field through Maxwell's modification of Ampère's circuital law.
In 1834, Charles Wheatstone developed a method of using a rapidly rotating mirror to study transient phenomena, and applied this method to measure the velocity of electricity in a wire and the duration of an electric spark. [1] He communicated to François Arago the idea that his method could be adapted to a study of the speed of light.
The relationships amongst electricity, magnetism, and the speed of light can be summarized by the modern equation: = . The left-hand side is the speed of light and the right-hand side is a quantity related to the constants that appear in the equations governing electricity and magnetism.
Conductor sizes range from 12 mm 2 (#6 American wire gauge) to 750 mm 2 (1,590,000 circular mils area), with varying resistance and current-carrying capacity. For large conductors (more than a few centimetres in diameter), much of the current flow is concentrated near the surface due to the skin effect. The center of the conductor carries ...
As noted in the previous section, Faraday's law is not guaranteed to work unless the velocity of the abstract curve ∂Σ matches the actual velocity of the material conducting the electricity. [31] The two examples illustrated below show that one often obtains incorrect results when the motion of ∂Σ is divorced from the motion of the material.