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Essay On Contact Resistance

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As mentioned previously, the surfaces of solids are always rough. The size of asperities can vary from the length of the sample to the atomic scale. By convention, the surface irregularities are classified into errors in form, waviness, roughness and sub-roughness (nanoscale roughness). The levels of roughness are associated with corresponding types of contact area (apparent, real and physical area of contact). Surface topography affects all the contact characteristics but primarily the mechanical ones. Another important factor affecting the contact behavior is the presence of various films (such as oxides, contaminants and reaction products). Contact resistance The current passes through the “a-spots” which are smaller than the real contact spots. Since the electrical current lines are constricted to allow them to pass through the a-spots, the electrical resistance increases. This increase is defined as the constriction resistance [Figure 3]. Contaminant films on the contact surfaces increase the resistance of a-spots. The resistance caused by these oxide or gas films (contaminants) is called interface resistance. The total resistance due to constriction and …show more content…

As part of my research regarding this topic, I found following results reported by G.E. Luke [6] regarding the temperature effects on contact resistance: Electrical contact resistance varies with temperature. A few tests that performed with copper resulted in slight decrease of contact resistance with increase in temperature. This indicates a negative temperature coefficient of contact resistance. Whereas, the contact resistances of brass and iron slightly increased with increase in temperature. Thus, contact resistance does vary with temperature but the variation is different for different metals in contact. Based on experiments conducted my G. Windred [4], the results he obtained with temperature changes are as

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