An electric circuit is made up of small distinctive elements to ensure the proper flow of electric current throughout a circuit. Therefore, several devices are used to maintain that smooth flow of electric current. One such device made up of resistive material that is used in an electric circuit is the resistor. The resistor is a self-induction device used to regulate electric flow throughout an electric circuit by providing the resistance required by the electric current. These resistors are distinctly categorised based on their compositions and manufacturing. The material used in manufacturing these registers describes the property and capability of that particular resistor.

What Do You Mean By Resistors?

A resistor can be defined as a device used to regulate the flow of electric current through an electric circuit. Basically, the resistor consists of copper wires surrounded by or enclosed within a ceramic rod or encapsulated with cement to make it insulated. The basic principle of the resistors is to regulate and maintain the flow of the electric current. Positioning of the resistors can be arranged in a linear manner or non-linear manner, as per the requirement. The basic application of the resistors is in burglar alarms, flame detectors, amplifiers, modulators, demodulators, etc.

Composition Of The Resistor Material

Each of the resistors is made up of a different composition of compounds. This composition of the resistor material describes its capability of maintaining electric flow through a circuit. The basic elements that are used in the manufacturing of resistor material are nickel-chromium alloy, carbon particles, and metal film, which might include nichrome. Moreover, various metal oxides are also used in the composition of the resistors. However, copper wire is one of the most important elements in constructing a resistor, and a ceramic coating on top of it makes it insulated.

Types Of Resistor Materials

On the basis of the chemical composition of the resistors, they are described into 6 distinct categories. The different types of resistor materials are as follows:

1. Wire-wound: The basic composition of the wire-wound resistor includes the winding of a resistive material, mostly a wire around a non-conductive core. Fundamentally, the core is made up of fibreglass or, most usually, ceramic, and the wire that is used for winding around that core is made up of nickel-chromium alloy. However, it cannot be used in a circuit whose power is more than 50 kHz.
2. Carbon composition: In the carbon composition resistor, the material used in resistors is carbon particles. The ability of this resistor depends upon the ratio of the carbon as well as the resistive material that is used in the manufacturing of this resistor. 
3. Carbon film: The carbon film resistor consists of carbon film that is spread over the cylindrical core of the resistor. The carbon film resistor can withstand a high energy range between 1 to 10 .
4. Metal film: The basic chemical composition that is used in the construction of the metal film resistor is nichrome. However, several other chemical compositions can also be used in the construction; the most commonly suggested material is tantalum nitride. These resistors are less stable than the wire-wound resistors.
5. Metal oxide film: As per the name, the metal oxide resistors are made up of metal oxides, for example, tin oxide. The basic advantage of metal oxide film resistors is that they have the capability of working in high-range temperatures.
6. Foil: One of the most stable resistors that are present to date is the foil resistor. The basic construction of the foil resistors involves thin metal foil as the resistive material along with the cemented substrate. Therefore, they have the property of a low-temperature coefficient.

What Is A Carbon Film Resistor?

The carbon film resistors are those resistors that are made up of carbon films deposited over the ceramic core. It is a type of fixed value resistor that is one of the most efficient. The basic construction of the carbon film resistor consists of a ceramic career that is surrounded or coated with a carbon film. This carbon film has a helical cut throughout the core in order to enhance and regulate the resistivity of the material. The shorter the pitch in the helical cut, the shorter will be the resistant path. Similarly, the smaller the pitch, greater will be the resistance. The ends of these cores are encapsulated with the help of lead. The carbon film resistors are basically used in electronics because they have a resistor value of 1 to 10,000 M. 

Conclusion

Resistors and self-induction devices are used in an electric circuit to maintain the proper conduction and resistance of the electric current flowing through the circuit. Resistance can be categorised on the basis of its composition, which is grouped into categories, including the carbon film resistor, wire-wound resistor, metal oxide resistors, etc. Each compound that is used in manufacturing has its own resistant property, which determines the capability and the overall property of the resistor. These are used in most electronic devices and play an effective role in maintaining proper flow throughout the circuit.