2007-12-04 00:15:41 · 3 answers · asked by solex 1 in Science & Mathematics ➔ Physics
The answer to the question would seem to be 'to convey information to the other end'. Have I missed something?
2007-12-04 01:36:26 · answer #1 · answered by za 7 · 0⤊ 0⤋
A metal cable consists of metal atoms that provide a cloud of relatively free electrons that can flow under electrical pressure (voltage). A battery can push a million electrons into one end of a wire and a million electrons will be pushed out the other end. Analogue and digital 'signals' are short pulses of electrons that are pushed along the cable and out the other end where special equipment can detect them and often amplify them. Analogue signals are often sinusoidal (wavelike) while digital signals are square-formed pulses of electrons separated by the absence of pulses.
2007-12-04 01:25:24 · answer #2 · answered by Kes 7 · 0⤊ 0⤋
In order to transmit electrical enery, you need a conductor. Since conductors are metals, if you want to transmit electrical data you need a cable made of metal.
2007-12-04 00:20:00 · answer #3 · answered by nyphdinmd 7 · 0⤊ 0⤋