## Introduction:

In this blog post, we will delve into the world of resistor & exploring the different types available. their construction unique characteristics, and common uses. Whether you are a beginner or an experienced engineer, this comprehensive guide will help you gain a deeper understanding of the various types of resistor and how to choose the right one for your project.

## What is a Resistor?

A resistor actively restricts the flow of current in a circuit. It measures in ohms / (Ω) and plays a vital role in regulating voltage and delivering power to electronic devices. Resistor ensures proper operation and prevents damage by controlling excessive current flow.

## Ohm’s law

Ohm’s law states that the current flowing through a conductor is directly proportional to the voltage across it, and inversely proportional to the resistance. This fundamental principle in electrical circuits, expressed as I = V/R, helps us comprehend the intricate relationship between voltage, current, and resistance. As a result, it significantly aids in facilitating effective circuit analysis and design.

## I = V / R

Moreover, the electrical power equation P = I × V = R × I^2 = V^2 / R. Intricately illustrates the interplay between power, current, voltage, and resistance. This equation unequivocally demonstrates that the power consumed by a resistor. In watts (W) is precisely determined by multiplying the current (I). In amps (A) with the voltage (V) in volts (V).

## What is the formula for Ohm’s law?

The formula for Ohm’s law states that the current flowing through a component, such as a resistor or a diode, is equal to the voltage across the component divided by its resistance. Moreover, there are three interchangeable formulas to express this relationship (see Figure ). These widely used formulas can be represented as a triangle, with voltage (V), current (I), and resistance (R) placed in different sections.

## Resistors in Series

In a series circuit, you connect resistors one after another, creating a single pathway for current flow. To calculate the total resistance, add up the individual resistances as the current encounters each resistor in sequence.

## Resistors in Parallel

In a parallel circuit, you connect resistors by joining their positive ends together and their negative ends together. This creates multiple paths for current flow, ensuring that each resistor receives the same voltage while dividing the total current among them.

## Inside the Resistor

Inside a resistor, several materials are commonly used. The main component is a resistive element, which determines the resistance value. Transitioning to the materials used, options include carbon composition, “metal film”, “carbon film” or wire-wound materials. Additional components, such as leads or terminals, and a protective coating or housing, provide insulation and physical protection.

## Types of Resistor

Types of Resistors, essential components in electronic circuits, can be classified into three main types: fixed, variable, and other. Fixed resistors have a predetermined resistance value and remain constant. variable resistors, on the contrary, allow for adjustable resistance. the “other” category encompasses specialized resistor types designed for specific applications, such as thermistors or light-dependent resistors ” LDR” . Let’s explore each type in detail.

## Fixed Resistor

Fixed resistors, which are widely utilized electronic components, hold the distinction of being the most commonly used resistors. They possess a defined ohmic resistance and, importantly, are not adjustable. As a result, fixed resistors play an indispensable role in numerous applications, solidifying their status as fundamental components in electronic circuits.

## Variable Resistor

A variable resistor, also known as a potentiometer, alters its resistance by adjusting the position of a slider. This feature enables their application in dimmer switches and volume controls, where the resistance can be modified to regulate the intensity of light or the level of sound.

## Other Resistor

Variable or dependent resistors, referred to as such because they rely on a physical quantity, exhibit changes in resistance based on factors like incident light, pressure, temperature, voltage, or magnetic field. These resistors are designed to actively adjust their resistance in response to variations in the specific physical parameter.

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