Explain contact resistance, Electrical Engineering

Explain Contact resistance.

Contact resistance: It is measured as the voltage drop from tail to tail of the mated contacts along with specified current flowing through the contact and is given in milliohms. The total resistance offered through a contact depends on the bulk resistivity of the contact material, actual surface area and mechanical wear of the contacts and environmental effects. To acquire low contact resistance this is essential that the contact must be a fine conductor of electricity. The contacts must have good mechanical resistance against wear due number of mechanical operations. The contacts are made by using alloys that have combination of mechanical properties, very fine electrical and thermal conductivity and resistance to corrosion. Usually used alloys are Beryllium copper, spring brass, low leaded brass and phosphor bronze. Plating of the contact metal is completed to prevent deterioration of contacts chemically and mechanically and to acquire good surface conductivity. Commonly utilized plating materials are as silver, copper, gold, tin (Pb) and nickel.

Posted Date: 5/17/2013 7:06:37 AM | Location : United States







Related Discussions:- Explain contact resistance, Assignment Help, Ask Question on Explain contact resistance, Get Answer, Expert's Help, Explain contact resistance Discussions

Write discussion on Explain contact resistance
Your posts are moderated
Related Questions
Three transformers are provided with the following rating values: 1) 2400/240 V, 55kVA, Req1 = (0.1 + 0.0Y) Ohm and Xeq1 = (0.15 + 0.XX) Ohm. 2) 240/120 V, 25kVA, Req1 = (0.1

Common channel signalling Signalling systems link the variety of switching systems, transmission systems and subscriber equipments in telecommunication network to enable

Hysteresis loss least depends on (A) Frequency.                         (B) Magnetic field intensity. (C) Volume of the material.     (D)Grain orientation of material.

(a) Draw and illustrate the V-I characteristics of PN junction diode. How the characteristics reflected with change in temperature? (b) Describe physically why a PN junction dio

Describe 74LS139 memory decoder. The 74LS139 is a dual 2-to-4 line decoder. This contains two separate 2-to-4 line decoders - all with its address, output and enable connection

Solve using data from the DC machine data sheet, using the "hot" resistance value for all calculations. Note that the value of K on the sheet is for rated (100%) field flux. Assum

Solution for dc motor speed and position controller

The automobile shall not rely on fossil fuel for energy. The automobile shall be designed using available and emerging technology. The automobile shall seat at least five

A three-phase transposed line is composed of one ACSR conductor per phase with flat horizontal spacing of 11 meters as shown in Figure (a). The conductors have a diameter of 3.625