Resistors- Important Facts You Need To Know

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A resistor is an electrical component that controls the flow of current in a circuit. Current via this component is directly proportional to the voltage across it and inversely proportional to its resistance and this relationship is commonly known as Ohm's Law. If you want to Buy Resistor Online in India then first consider its best types and compare the products on the basis of several parameters. Carbon-composition resistor is the most common type in an electronic device and system.

Types of resistors

Resistor is an electronic device that can be made of several materials and methods. Below listed are some of the main types of resistors:

1. Carbon composition

2. Wire-wound

3. Foil resistor

4. Metal film

5. Thick and thin film

6. Carbon film

All of the resistors have different characteristics. Some are cheap and some are very accurate. Some can resist high temperatures while others can withstand high power. Some of the resistors are perfect for high-power applications while others are good for low noise applications and some for measurement circuits.

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... of resistors

The flow of electric current through resistance generates heat. The produced heat creates an increase in the temperature above the ambient temperature. The physical ability to hold up, without decline, the temperature reaches, limits the value of operating temperature that can be tolerable. Resistors are considered to dissipate certain wattage without going beyond a particular standard "hot spot" temperature.

Things to look after while choosing the best and needed resistor

Selection of a resistor for specific application requires three steps i.e. find out the resistance, determine the physical size/watt size as controlled by permissible temperatures, volts, watts, circuit conditions, and mounting conditions. Apart from considering the rating and most suitable kind of resistor, you must understand the way in which the component needs to be installed. It can be mounted using different methods such as PC Mount Resistors, Bracket Mount Resistors, Surface Mount Resistors, and Panel Mount Resistors.

Specifications of Resistors

• Tolerance

Tolerance can be defined as deviation from the real value. None of the material is 100% accurate because each of them has some percentage of errors, design fault, and mistakes. Therefore, it is necessary to determine the tolerance of resistor generally represented in percentage and range from 5 to 20 percent. Genuine tolerance is marked on color code of a resistor.

• Maximum Operating Conditions

It includes maximum operating temperature and voltage and helps user find out resistance to be used in circuit. Before you Buy Resistors, consider essential specifications ensuring proper balance for effective functioning of an electronic circuit.

• Resistivity of Resistors

Resistivity of a resistor is totally dependent on the material used for resistor’s fabrication. In simpler words, it is a term that describes the particular resistance of a material and mainly calculated on the basis of unit length and unit cross-sectional area.

• Power Rating of Resistors

It is defined as resistor’s power handling capacity and is expressed in Watt. The size of a resistor is based on it. Resistors having high power ratings are generally bigger in size. It can be calculated using the formula, P = V * I (Watt)