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Why are coaxial cables used for cable TV transmission and normal wires used for electricity transmission?
Wiki User
∙ 8y ago
The simplest explanation (and therefore not completely accurate, but it will help you understand what happens) is that as the frequency of an AC signal increases the less able a wire is to contain it.
- at very low frequencies, including those of powerlines, the current flows easily through the entire diameter of the wire
- at intermediate frequencies, up to about the AM radio band, the current avoids the center of the wire, only flowing through its surface
- at high frequencies, including those used for TV, a significant amount of the AC signal escapes from a wire as electromagnetic radiation - the shield on a coaxial cable "reflects" this electromagnetic radiation back to the center conductor, preventing its loss
- at microwave frequencies AC will not follow a wire at all and the electromagnetic radiation is directed around through metal pipes called waveguides (analogous to a coaxial cable but without a center conductor, only the outer shield to reflect the electromagnetic radiation)
Wiki User
∙ 8y ago
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What is difference between coaxial cable and twisted pair cable?
The answer is in the name of the cables; co-axial cable has an outer an inner part which share a common axis (hence the name co-axial). Usually the outer part acts as a screen to protect the inner part from electrical interference. Twisted pair cable consists of a number of pairs of cables. Each pair is twisted together and is used for a single signal; one side of the pair sends the normal signal, the other sends the inverted version. At the receiving end, the normal and inverted signals are subtracted, because any electrical noise is likely to affect each of the pair of cables equally (because they are coupled together by being twisted), subtracting the two should produce a noise free resulting signal. There are variations; sometimes each pair is screened - improving the noise immunity, particularly from other signals in the same cable - sometimes the entire bundle of cables is screened. Occassionally, both the individual pairs are screened and the bundle is also screened.
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