Types of Resistors

Resistors are electronic components that limit or resist the flow of electrical current through a circuit. There are several types of resistors commonly used in electronic circuits, each with their specific features.

 

Carbon Composition Resistor: This is one of the oldest and most common types of resistors. It is made of carbon particles mixed with a binder material and molded into the desired shape. They have high noise and temperature coefficients and are not suitable for high-frequency applications. Commonly used in low-power circuits, with poor durability and temperature stability.

Metal Film Resistor: This type of resistor is made of a metal film deposited onto a ceramic substrate. Metal film resistors have better accuracy and stability than carbon film resistors and can handle higher power ratings.

Wirewound Resistor: A wirewound resistor is made by winding a metal wire around an insulating core. They are highly accurate and stable but are relatively expensive. Wirewound resistors are used in high-power applications.

Thick Film Resistor: Thick film resistors are made by depositing a thick layer of conductive material on a ceramic substrate. They offer excellent stability and precision and are used in temperature-sensitive applications.

Surface Mount Resistor: Surface mount resistors (SMDs) are tiny resistors that can be mounted directly on the surface of a printed circuit board. They are commonly used in electronic devices where space is limited.

Metal Oxide Film Resistor: Metal oxide film resistors are similar to film resistors, except they have a thin layer of metal oxide deposited on the ceramic substrate. They have a low temperature coefficient and are more stable than carbon composition resistors.

Variable Resistor: A variable resistor, also known as a potentiometer, is a resistor that allows the resistance value to be adjusted manually.  They are often used for tuning circuits or adjusting the volume of audio equipment.