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→6.4.2 Contact Physics – Formulas
===6.4.2 Contact Physics – Formulas===
*'''Constriction resistance''' <br />R<sub>e</sub> = D\rho/2a
(Single spot contact according to Holm; circular touching spot between clean
contact surfaces)
R<sub>e</sub> = D\rho/2Na
(Multi-spot contact according to Holm without influence between the N
individual spots)
R<sub>e</sub> = D\rho/2 x E ai \sum a<sub>i</sub> + 3B D3 \pi \rho/32N² x E E \sum \sum (sijs<sub>ij</sub>) i = \neq j
(Multi-spot contact according to Greenwood considering the influence between
the spots)
*'''Contact resistance''' <br />R<sub>K</sub> = R<sub>e</sub> + R<sub>f</sub>
