What are the Popular Models of Resistors Supplied?

I. Introduction

A. Definition of Resistors

Resistors are passive electronic components that limit the flow of electric current in a circuit. They are essential for controlling voltage and current levels, ensuring that electronic devices operate safely and effectively. By providing resistance, they help to manage the power distribution within circuits, making them a fundamental building block in electronics.

B. Importance of Resistors in Electronic Circuits

In electronic circuits, resistors play a crucial role in protecting sensitive components from excessive current, dividing voltages, and setting bias points for transistors. Their ability to control current flow is vital for the functionality of various devices, from simple household appliances to complex computer systems. Without resistors, circuits would be prone to damage and malfunction.

C. Overview of the Article

This article will explore the different types of resistors, focusing on popular models supplied in the market. We will delve into fixed, variable, and specialty resistors, discussing their characteristics, applications, and notable models. Additionally, we will highlight factors to consider when selecting resistors for specific applications.

II. Types of Resistors

A. Fixed Resistors

Fixed resistors have a constant resistance value and are the most commonly used type in electronic circuits. They come in various materials and constructions, each with unique characteristics.

1. Carbon Composition Resistors

These resistors are made from a mixture of carbon and a binding material. They are known for their high energy absorption and are often used in applications where high pulse loads are expected.

2. Metal Film Resistors

Metal film resistors are made by depositing a thin layer of metal onto a ceramic substrate. They offer high precision and stability, making them ideal for applications requiring accurate resistance values.

3. Carbon Film Resistors

Similar to metal film resistors, carbon film resistors are made by depositing a thin layer of carbon. They provide good performance and are widely used in general-purpose applications.

4. Wirewound Resistors

Wirewound resistors are constructed by winding a metal wire around a ceramic or fiberglass core. They can handle high power levels and are often used in power applications.

B. Variable Resistors

Variable resistors allow for adjustable resistance values, making them versatile components in electronic circuits.

1. Potentiometers

Potentiometers are three-terminal devices that can adjust voltage levels in a circuit. They are commonly used in volume controls and tuning applications.

2. Rheostats

Rheostats are two-terminal variable resistors used to control current. They are often found in applications requiring high power, such as in lighting controls.

C. Specialty Resistors

Specialty resistors are designed for specific applications and have unique characteristics.

1. Thermistors

Thermistors are temperature-sensitive resistors that change resistance with temperature variations. They are widely used in temperature sensing and control applications.

2. Photoresistors

Photoresistors, or light-dependent resistors (LDRs), change resistance based on light intensity. They are commonly used in light-sensing applications, such as automatic lighting systems.

3. Varistors

Varistors are voltage-dependent resistors that protect circuits from voltage spikes. They are often used in surge protection devices.

III. Popular Models of Fixed Resistors