May. 13, 2024
Electronic Components & Supplies
We recognize that one of the primary functions of a resistor is to regulate current flow. In a resistor, electrons collide with ions, causing a reduction in the flow of electricity, and subsequently decreasing the current while generating heat. A resistor with high resistance signifies that less current will flow through it for any given voltage.
Highlighted below are common applications and uses of resistors:
Resistors come in various types of fixed resistors, designed based on their intended range of use. Adjustable resistors, for instance, allow resistance settings to be modified using a knob-like mechanism. Altering the resistance changes the current flow within the circuit, as is seen in applications such as motor speed control, tone modulation in musical instruments, and amplifier volume adjustments.
Voltage division is relevant when certain components operate at voltages lower than the supplied input. Series-connected resistors help evenly distribute the voltage drop across each resistor, ensuring safe operation of components designed for such lower voltages.
Given their tendency to produce heat while conducting current, resistors are utilized in various heating devices including heaters, toasters, microwaves, and electric stoves. For example, in a light bulb, the metal filament emits light by heating to a very high temperature due to the resistance it provides to electrical flow.
Resistors are key elements in timing and frequency control circuits. They are used in light flashers, electronic sirens, and blinking lights for aircraft or towers, serving as collision avoidance measures. They operate by storing current for a specified time before discharge, where the resistor determines current flow rate based on allotted time. Increased resistance extends the discharge period.
LEDs and transistors can be susceptible to damage if exposed to excessive current. Including a resistor in the circuit helps maintain the current within safe operational limits, protecting these sensitive components and ensuring their functionality within specified current ranges.
These were some practical applications of resistors. For more detailed information, consider exploring resources such as BYJU'S The Learning App.
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Frequently Asked Questions – FAQs
Q1
What is a resistor?
A resistor is a two-terminal electrical component used to provide resistance to the flow of electric current. In electronic circuits, resistors primarily serve to limit current, divide voltages, block transmission signals, and set bias for active elements.
Q2
What are the two types of linear resistors?
Linear resistors are classified into fixed resistors and variable resistors.
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Q3
What are the main types of fixed resistors?
The principal types of fixed resistors are wire-wound resistors, thin-film resistors, and carbon composition resistors.
Q4
What are the main types of variable resistors?
The main categories of variable resistors include potentiometer, thermostat, and trimmer resistors.
Q5
What is the use of resistors in the case circuits with LEDs?
Excess current can damage LEDs due to their sensitivity to electrical variations. Resistors are used to manage the current flowing through the circuit, ensuring LEDs and other semiconductor devices operate within optimal current ranges.
Resistors come in a wide variety, and understanding the role of ROHM's resistors involves classification by materials, shape, integration level, and functionalities.
Based on their functionality, resistors are categorized into fixed and variable types. The typical "resistor" generally refers to a fixed resistor.
Variable Resistors:
Variable resistors consist of a fixed resistor element and a slider which makes contact with the primary resistor element. This setup provides three connection points: the fixed resistor element, the main resistor element, and the slider. The component acts as a variable potential divider when all three connections are utilized. For variable resistance, the slider can be connected at one end.
Fixed Resistors:
Fixed resistors are extensively used in electronic circuits to establish specific conditions. Their values are determined during the design phase and are meant to remain unchanged to maintain the circuit's performance.
Thin-film technology is predominantly used in manufacturing fixed resistors, particularly surface mount resistors. This technology is widespread due to the extensive use of these resistors in modern electronics.
The diagrams above show the cross-sectional views of surface-mounted resistors.
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