Resistor: The Fundamental Component in Electronics
by Yuvi K - December 17, 2023
Resistor – The Fundamental Component in Electronics
Resistor is an essential part of electronic circuits. It is a two-terminal, passive electrical component which helps to regulate the flow of electric current. It helps control the voltage and current in electrical circuits. It is one of the most common components used in electronic circuitry.
What Does A Resistor Do?
A resistor helps to control the amount of current flowing in a circuit. It restricts the flow of electrons so that the circuit can operate within safe parameters. For example, if a regular, unmodified circuit had too much current flowing through it, it could cause it to damage the circuit, or even cause a fire, if the current were not reduced appropriately. When a resistor is added to the circuit, it reduces the current flowing through it, protecting the circuit from damage.
Types of Resistors
There are various types of resistors available, each providing different electrical properties and features.
Fixed Resistor
The most common type of resistor is the fixed resistor. As the name suggests, it has a fixed electrical value and therefore, it provides a constant resistance regardless of other factors such as temperature, voltage or current. There are several types of fixed resistors, such as carbon resistors, metal film resistors and wire wound resistors.
Variable Resistor
Unlike the fixed resistor, a variable resistor has an adjustable value. This type of resistor has a contact or ‘wiper’ that can be moved along a resistance track to vary the amount of resistance across it. This type of resistor can be used to adjust the volume, brightness and speed of electric circuits.
Other Types of Resistors
Other than the two main types of resistors, there are several other types of resistors available. They include rheostats, light dependent resistors, thermistors and more.
Resistor Symbols
| Type of Resistor | Symbol |
|---|---|
| Fixed resistor |  |
| Variable resistor |  |
Why Are Resistors Used?
Resistors are used for various reasons, such as:
- To reduce current flow in a circuit. This helps protect components from damage and also helps regulate the amount of current in the circuit.
- To reduce voltage. By connecting a resistor in series with a power supply, it can reduce the voltage applied to a circuit or device.
- To measure voltage or current. When connected in series with a circuit, a resistor can be used to measure voltage or current in a circuit.
- To provide feedback in electronic amplifiers. Also known as a feedback resistor, it provides feedback to the input of an amplifier and helps maintain stability and prevent distortion.
Conclusion
In summary, resistors are essential components in any electronics circuit. They are used to regulate the current, voltage and other factors in a circuit. They come in various types and shapes with different properties to suit different applications. They are used to provide stability, measure voltage and current, and protect components from damage. Without resistors, electronic circuits would be impossible to build.
