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→6.4.1 Definition of Terms and Symbols
*'''Load bearing contact area A<sub>t</sub>''' <br />is the part of the apparent contact area which is affected by the contact force. It is the sum of all microscopic actual touching points.
*'''Effective contact area A<sub>w</sub>''' <br />is the part of the load bearing contact area through which current is flowing and therefore the sum of all current carrying touching areas (a-spots), A<sub>w</sub>< A<sub>t</sub>< A<sub>s</sub>.
*'''Contour area A<sub>n</sub>''' <br />is the contiguous area which includes all effective a-spots, A<sub>w</sub>< A<sub>n</sub>< A<sub>s</sub>; A<sub>n</sub>≠ A<sub>t</sub>.
*'''Contact resistance R<sub>k</sub>''' <br />is composed of the constriction resistance and the film resistance.