• Latest
  • Trending
  • All
  • Capacitors
  • Resistors
  • Inductors
  • Filters
  • Fuses
  • Non-linear Passives
  • Applications
  • Integrated Passives
  • Oscillators
  • Passive Sensors
  • New Technologies
  • Aerospace & Defence
  • Automotive
  • Industrial
  • Market & Supply Chain
  • Medical
  • RF & Microwave
  • Telecommunication

What is a Resistor ?

21.1.2022

Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

26.5.2022
Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

26.5.2022

Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

26.5.2022

Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

25.5.2022
  • Home
  • Privacy Policy
  • EPCI Advertisement & Membership
  • About
No Result
View All Result
NEWSLETTER
Passive Components Blog
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication

    Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

    Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

    Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

    Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

    Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

    A set of printed sample cubes showcasing the effects of laser power and print speed on the magnetic core structures. Image source: Tallinn University of Technology

    Researchers 3D Printed Superior Soft Magnetic Cores with Laser Additive Process

    TDK Introduces Improved Performance PFC Capacitors

    Yageo Venture to Acquire 30% of APEC and Step Into Semiconductor MOSFET Business

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Stackpole Presents High Current Metal Shunt Resistors

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Coverlay – More than a Flexible Soldermask Substitute; WE Webinar

    Soldering THT Components by SMD Reflow Assembly; WE Webinar

    Strain Gage Resistive Sensor Simulation; Vishay Video

    EMC Filters Explained – from Component to Design; WE Webinar

    How to Avoid EMI Noise on Data Cable by Isolated Power Module; WE askLorandt Video

    Introduction to Wireless Power Transfer; WE Webinar

    How to Pass Conducted Emissions Using Line Filters; WE Webinar

    EMI Debugging of a Low Power Buck Converter; WE Webinar

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Preferred Suppliers
  • Who is Who
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication

    Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

    Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

    Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

    Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

    Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

    A set of printed sample cubes showcasing the effects of laser power and print speed on the magnetic core structures. Image source: Tallinn University of Technology

    Researchers 3D Printed Superior Soft Magnetic Cores with Laser Additive Process

    TDK Introduces Improved Performance PFC Capacitors

    Yageo Venture to Acquire 30% of APEC and Step Into Semiconductor MOSFET Business

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Stackpole Presents High Current Metal Shunt Resistors

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Coverlay – More than a Flexible Soldermask Substitute; WE Webinar

    Soldering THT Components by SMD Reflow Assembly; WE Webinar

    Strain Gage Resistive Sensor Simulation; Vishay Video

    EMC Filters Explained – from Component to Design; WE Webinar

    How to Avoid EMI Noise on Data Cable by Isolated Power Module; WE askLorandt Video

    Introduction to Wireless Power Transfer; WE Webinar

    How to Pass Conducted Emissions Using Line Filters; WE Webinar

    EMI Debugging of a Low Power Buck Converter; WE Webinar

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Preferred Suppliers
  • Who is Who
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

What is a Resistor ?

21.1.2022
Reading Time: 6 mins read
0 0
0
SHARES
50
VIEWS

This article explains very basic definition of What is electrical resistance, What is a Resistor ? as passive electronic components and its main application and technologies.

The very basic definitions:

RelatedPosts

Non-Linear Resistors: Thermistors, Varistors, Memristors

Potentiometers, Rheostats and Trimmers

MELF, SMD Resistors and Resistor Network

What is Electrical Resistance ?

Physical property in conductor or of a component which transforms electrical energy into heat

What is Electrical Resistor ?

Resistors are passive electrical components that limits the flow of electric current.

Component R that has no significant distortion of phase at an applied voltage U and the resulting flow of current I

Resistors, like inductors and capacitors, are passive electronic components which are quite simple in theory but rather more complex when the behaviors of real-world devices are considered. Any resistor that one can build or buy is non-ideal in some respect that renders it unsuitable for some purposes; the various products available offer different balances of imperfection in an effort to be found good enough for others..

Resistors can be found in almost all electrical networks and electronic circuits. The resistance is measured in ohms. An ohm is the resistance that occurs when a current of one ampere passes through a resistor with a one volt drop across its terminals. The current is proportional to the voltage across the terminal ends. This ratio is  represented by Ohm’s law basic equation [1] and related equations for power, current, voltage and resistance in Figure 1.:

Ohm’s law equation [1]

where

U= applied voltage;
R= resistive value;
I= resulting current

Figure 1. Ohm’s law power, current, voltage and resistance equations

Despite the Ohms’ law is one of the most frequent used relationship for components and circuits, there is some limitation for it validity at:

  • high frequencies (relaxation, skin effect)
  • high field strengths (flashovers at highly resistive materials)
  • very low temperatures (superconductivity)

Resistors have several properties besides their rated resistance, such as their temperature coefficient, resistor noise and power rating. These resistor properties can be important to take into account depending on the application.

Resistors are used for many purposes. A few examples:

  • delimit electric curren
  • tvoltage division
  • heat generation
  • matching and loading circuit
  • control gain
  • fix time constants
  • current measurements

They are commercially available with resistance values over a range of more than nine orders of magnitude. They can be used to as electric brakes to dissipate kinetic energy from trains, or be smaller than a square millimeter for electronics.

Resistor technologies differ in features, range of electrical parameters covered. Lets start our course to learn some basics about them and what technologies are available today.

Resistor Terms and Definitions

Nominal Resistance

Designed resistance value usually indicated on the resistor.

Power Rating

Maximum allowable power at rated temperature. Some of our chip resistor arrays and networks specify the whole power rating as a package.

Rated Temperature

Maximum ambient temperature at which the power rating may be applied continuously. The rated ambient temperature refers to the temperature around the resistor mounted inside the equipment, not to the air temperature outside the equipment.

Rated Terminal Part Temperature

Maximum terminal part temperature of the surface mount resistor at which the power rating may be applied continuously. Includes the temperature rise by self heat generation.

Derating Curve

Curve that expresses the relation between ambient temperature and the maximum allowable power, which is generally expressed in percentage.

Rated Voltage

Maximum allowable D.C. or A.C. voltage (RMS), capable to be continuously applied to a resistor or a resistor element under the rated ambient temperature or terminal part temperature, which is calculated from the rated power and nominal resistance using the following formula.

Rated voltage shall not exceed the max. working voltage.

Critical Resistance

The maximum nominal resistance value at which the rated power can be applied without exceeding the maximum working voltage. The rated voltage is equal to the max. working voltage at the critical resistance value.

Max. Working Voltage

Maximum D.C. or A.C. voltage (RMS) that can be continuously applied to the terminations of a resistor. However, the maximum value of the applicable voltage is the rated voltage at the critical resistance value or lower.

Maximum working voltage and rated voltage are calculated direct-current voltages based on rated power. Sine wave is assumed for the alternate-current so the peak voltage should be √2 times the maximum working voltage. When the wave form is not a sine wave, or when the resistance value exceeds the critical resistance, please contact manufacturer/consult the product datasheet for the applicable peak voltage.

Overload Voltage

Allowable voltage which is applied in 5 sec. under short time overload test. Overload voltage shall be 2.5 times of rated voltage or max. overload voltage, whichever is lower.

Max. Overload Voltage

Figure 2. Maximum value of resistor overload voltage – example; source KOA.

Dielectric Withstanding Voltage

A.C. voltage (RMS) that can be applied to a designated spot between the electrode and the outer coating in one minute, in the voltage proof test (JIS C5201-1 4.7).

Temperature Coefficient of Resistance(T.C.R.)

Relative variation of resistance between two given temperatures when temperature is changed by 1K.

Related Posts

Aluminium Capacitors

Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

25.5.2022
17
Applications e-Blog

Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

23.5.2022
46
Applications e-Blog

Coverlay – More than a Flexible Soldermask Substitute; WE Webinar

19.5.2022
15

Popular Posts

  • What is a Dielectric Constant of Plastic Materials ?

    4 shares
    Share 4 Tweet 0
  • Understanding High-Precision Resistor Temperature Coefficient of Resistance

    0 shares
    Share 0 Tweet 0
  • Ripple Current and its Effects on the Performance of Capacitors

    3 shares
    Share 3 Tweet 0
  • Capacitor Selection for Coupling and Decoupling Applications

    28 shares
    Share 28 Tweet 0
  • How to Choose the Right Inductor for DC-DC Buck Applications

    0 shares
    Share 0 Tweet 0

Newsletter Subscription

 

  • Home
  • Privacy Policy
  • EPCI Advertisement & Membership
  • About

© 2021 EPCI - Premium Passive Components Educational and Information Site

No Result
View All Result
  • Home
  • News
  • Video
  • Knowledge Blog
  • Preferred Suppliers
  • Events

© 2021 EPCI - Premium Passive Components Educational and Information Site

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In
This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.