I saw this on current flow
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LoginWith direct current, the charge flow is distributed throughout the cross-sectional area of a conductor. With alternating current, the charge flow tends to flow towards the surface of a conductor due to what is called the 'skin effect'. The higher the frequency, the greater the skin effect. In fact, at ultra-high frequencies, tubes are used because practically no current would flow through the centre of the conductor -these tubes are known as 'wave guides'.
Since resistance is inversely proportional to area, the resistance a conductor offers to alternating current is somewhat higher than the resistance to direct current, because of the effective reduction in cross-sectional area due to the skin effect. This is termed 'AC resistance'.
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