Editing Alternating current (section)

== Information transmission ==
Alternating current is used to transmit [[information]], as in the cases of [[telephone]] and [[cable television]]. Information signals are carried over a wide range of AC frequencies. [[Plain old telephone service|POTS]] telephone signals have a frequency of about 3&nbsp;kHz, close to the [[baseband]] audio frequency. Cable television and other cable-transmitted information currents may alternate at frequencies of tens to thousands of megahertz. These frequencies are similar to the electromagnetic wave frequencies often used to transmit the same types of information [[wireless|over the air]].