Factors that Affect Electrical Resistance

Manufacturers of electric or electronic circuits make them for specific purposes and usually have to introduce exact amounts of resistance. This is possible when they add small components known as resistors. A resistor is a tiny package of resistance: when wired into a circuit, it can decrease the current by a particular amount. Though all resistors can look the same from the outside, they're actually not. In fact, resistance is affected by several factors. See the best information about power resistors company.

For example, let's say you want to force water down a pipe. There are many different types of pipes you can use. A fatter one will not resist the water as much as a thinner one would do, in the same manner a shorter pipe will be easier on the water than a longer one. If you put sponge inside the pipe, water will still pass through it but a lot more slowly. Therefore, the pipe's length, thickness and internal environment all impact its resistance to water.

The same is true for resistors. A material's resistance (R) is stronger when it is longer (longer wires have more resistance), as well as when it's thicker (thinner wires have less resistance). Resistance is also affected by to the type of material a resistor is made from. Various materials have unique resistivities. For instance, conductors have a lot less resistivity than insulators. Aluminum comes has substantially lower resistivity compared to copper at room temperature. Silicon, which is a semiconductor, also has less resistivity than glass, an excellent insulator. You can see that different conductors and insulators differ widely in their ability to carry electricity.

However, a resistor's resistance isn't fixed, regardless if it's a particular material of a certainarea and length. It constantly goes up as temperature increases. The reason? Heat makes a material's atoms or ions move about, making it more difficult for electrons to pass through, hence the higher electrical resistance. Learn more about current shunt resistor company.

Generally, most materials' resistivity moves linearly with temperature, so if the temperature rises 10 degrees, the resistivity goes up by a specific amount too. If you reduce a material's temperature, you decrease its resistivity as well. If you lower the temperature to extreme levels, you can even achieve superconductivity, a state in which a material's resistivity is completely neutralized.

Resistance has various daily applications, such as in transistor radios and TV sets. Let's say you want to reduce the volume on your TV or radio. When you turn the volume knob and the sound is reduced, you are actually increasing the resistance in an electrical circuit that produces your TV or radio's sound. Similarly, increasing the sound is possible by decreasing the resistance.