Varistor

What is a Varistor? A varistor is a voltage dependent resistor (VDR).…

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Understanding Electrical Transformers

AC electrical systems make extensive use of transformers. A…

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Coupling and Decoupling

Decoupling capacitors When designing a circuit, many novice engineers…

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AC Power Analysis In Reactive Circuits

We already know that purely reactive components (or purely reactive…

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Sinusoidal Steady State Power and Average Power

In this page, we will expand and reinforce our understanding of power…

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Power Factor And RMS Explained

In the previous page, we saw that the mathematical representation of…

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Polymer Capacitor

What are polymer capacitors? Polymer capacitors are capacitors which…

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How To Calculate Power Factor Correction

As you now know, reactive components can cause a circuit’s power…

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Electrolytic Capacitor

What are electrolytic capacitors? An electrolytic capacitor is a type…

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Triangle Of Power And Power Factor

In a purely resistive AC circuit, power is simply power. If we add…

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Capacitors in parallel

Capacitors, like other electrical elements, can be connected to other…

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Measurements In Electrical Engineering

Powers of Ten A numeral system is a method of using certain digits to…

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Variable Resistor

What is a Variable Resistor? A variable resistor is a resistor of…

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Resistor Noise

What is Resistor Noise? Noise is an unwanted phenomenon for resistors.…

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PTC Thermistor

What are PTC Thermistors? PTC stands for "Positive Temperature…

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Resistor Books and Online Resources

On this page you will find a collection of valuable books and other…

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Resistor Symbols

All types of resistors have their own resistor symbols which are used…

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About the Authors

Robert Keim Robert Keim graduated from the University of California,…

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Capacitors in series

Capacitors in series Like other electrical elements, capacitors serve…

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Air Capacitor

What are air capacitors? Air capacitors are capacitors which use air…

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Resistor SMD Code

What are SMD Resistors?   SMD resistors on a printed circuit…

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Dielectric Materials

Dielectric materials Dielectric materials are essentially insulators,…

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Temperature Coefficient of Resistance

Resistance Changes with Temperature The temperature coefficient of…

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Metal Oxide Film Resistor

What are Metal Oxide Film Resistors? Metal-oxide film resistors are…

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Ceramic Capacitor

What are ceramic capacitors? A ceramic capacitor uses a ceramic…

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What Is Wye And Delta?

We learned in a previous page that resistors can be connected in…

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NTC Thermistor

What are NTC Thermistors? NTC stands for "Negative Temperature…

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Capacitance

What is capacitance? Electric capacitance is the ability of a…

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Filter capacitor

Filter capacitors Capacitors are reactive elements, which make them…

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Resistors in Series

How to Calculate the Equivalent Resistance For Resistors in Series?…

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Standard Resistor Power Ratings

An electrical device’s power rating provides a general idea of…

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