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A good electrical contact requires a clean metal to metal surface, and sufficient force to bring these clean surfaces into intimate contact. Gold is often used as a plating for contacts to aid this function.
In some sealed environment switches, Mercury is added to reduce the contact resistance (magnetic switches) .
What else can I help you with?
Can you give me some examples of Parameter?
the answer the paremeter is metro sentral
How resistence important?
Resistance is important because it is what resists the flow of charge and can give off heat. Light bulbs use resistance to give off their light since the light is from the heat given off from resistance.
How do you find specific resistance of a contact on semiconductor?
The problem that you face is that there is a resistance derived from the contact and a resistance derived from he semiconducting material itself. The trick is to separate the two resistance values. To do this you will need to set up a series of contacts. Each of the pairs of contacts will need to be separated by a different distance through the semiconducting material. I would suggest at least three pairs but the more you use the more accurate your contact measurement will be. Use a Kelvin, or 4-point measurement technique. This is done by using, as the name suggests, four probes. with two probes apply a small but known current through the contact pairs and semiconductor. Using the other probes measure the voltage difference from one contact to the other. The voltage drop, and current flow will give you the resistance across the contact pair (Resistance = Volts / Current). This gives you the resistance of two contacts and a resistance of a small amount of semiconductor. Now do this to all three different contact pairs with different spacings of semiconductor. Of course, the longer the semiconductor spacing the more the total resistance will be. If you plot these values as a line (using the spacings as an X-axis, resistance on the Y-axis), you will be able to extrapolate what the resistance would be if there were the theortical value of zero spacing, or no contribution from the semiconductor (the Y-intercept). Now this is the value of two contacts so you will have to divide this value by 2. And it is also the value of the specific area of the contact you used. The larger the area the less the contact resistance. So Divide the contact resisance by the area. The typical units to report this number is in Ohms/cm^2 (ohms per centimeter squared). By the way, this in theory could be done using less points, however you need to be aware that the linearity of your measurements is important. In practice the contacts (even good ones called 'Ohmic Contacts') are not perfect. Measuring at least three (I use five) pairs of contacts will give you a way to see if you are getting a good reading of the contact resistance. If you get a correlation coefficient, (R-squared available on an Excel spreadsheet), for your data to a best-fit line of 0.9 or better you are getting a 'reasonable' contact resistance measurement.
Why is it important to know who created a website?
It is important to know who created a website so that you can give them credit. You could also contact them if you need to.
How important is eye contact during a handshake?
if you dont give eye comtact then somebody will think you dont want to meet them
Which give maximum resistance to the british?
mugals
Can you Give you 10 facts about viscosity?
resistance
Why are protective supporters important for boys in contact sports?
so the boys do not get hurt or give up. And they are needed later in life as well
What is the main function of the resistance band workout?
The main function of the resistance band workout is to gain resistance in working out. It will give you different results then not using resistance in your work out.
What is the difference between coefficient and parameter?
In an algebraic expression (or equation), a coefficient is the numerical multiplier for a term. If the coefficient is, itself, a variable, then it is a parameter. For example, the equation of a straight line in 2-d is y = mx + c where x and y are the coordinate variables, m is the parameter which defines the slope, and c is the parameter which defines the y-intercept. Different values of m will give a set of lines with the same intercept, whereas different values of c will give a set of lines with the slope. Varying both, together, will generate all possible lines. By contrast, in the equation y = 2x + 5, 2 is the coefficient of x and 5 is the constant [coefficient]. They are specific values of the parameter whic define a specific line.
Why is eye contact important in the western world?
Because its seen as a way of showing interest in what the person speaking has to say. It can be seen as rude if you don't give eye contact to some degree, like you believe you are superior to the speaker.
What is a lead indicator?
A lead indicator is a measurable parameter or metric, which will help to predict or give prior information about the occurence of some related critical problems or events.
