In order for an electronic device or gadget to operate, it has to be powered. This is done through the provision of electric power. This power is supplied in the form of electric currents. The current also flows within a complete or closed circuit. In every circuit, these currents have the potential of destroying the entire device unless there is a component to withstand this flow. This is the major purpose of having a power resistor.
This is what makes every electronic gadget to contain a power resistor. It helps in ensuring the device withstands any form of the electric current flow regulating the power that the device will use. Due to complexities that come with electronic devices, there are different types of resistors that one can choose from. Some are very small like surface mount chips while others are large and occupy a large volume of space such as the grid and wirewound resistors.
However, most of these components are linear producing a certain volume of voltage drop from every circuit completed. This is achieved because all resistors obey the Ohms Law making them a compulsory or fundamental component in every device. They also have different values of resistance to current voltages. However, when selecting a resistor, certain features or properties are worth considering.
1. Composition materials.
Power resistors are made using different composing materials. The most common materials used include carbon and metal. Carbon is the most common material used for lightweight machines and devices. This is because they are cheap, efficient and general purpose. They also contain a resistive element that cannot be found in other types of resistors.
During manufacture, finely ground carbon together with graphite materials are used. A nonconductive material such as clay or ceramic is used to bind them as well as insulating the mixture. The ratio between the insulator and the conductor is what determines the resistive power. This principle or resistance is what is used in the manufacture of film type resistors. Find the best current sense resistors or check out this wirewound resistors company.
The other types include the current shunt resistors and the Wirewound resistors. A wirewound resistor is made using the nichrome principle. A spiral helix is rolled around a ceramic former. The current speed is lowered down and withheld by the coiled wire. By the time the current finishes to rotate through the wire, its speed and power are low.
These resistors are also covered with insulating enamels or paints that help the resistor to tolerate high temperatures. Current shunt resistors, on the other hand, use the power and heat principle. They are mostly used in electronics such as iron boxes. When the power is at the maximum limit, the resistor switches off. You can read more on this here: https://www.ehow.com/how_8364922_wire-endofline-resistor.html.