Basic DC Circuit Theory

Voltage and Current Relationship The earth is a dynamic place. Objects…

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Resistors for LED Circuits

Resistors in Light Emitting Diode (LED) Circuits An LED (Light…

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Fixed Resistor

What is a Fixed Resistor? Fixed value resistors have a defined ohmic…

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Motor starting capacitor

Motor capacitors AC induction motors use a rotating magnetic field to…

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Current limiting

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Capacitors in parallel

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

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Photoresistor

What are Photoresistors? Photoresistors, also known as light dependent…

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Heater Resistor

What are Heater Resistors? Heater resistors are used whenever an…

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Power Resistor

What Are Power Resistors? Power resistors are designed to withstand…

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Carbon Composition Resistor

An Introduction to Carbon Composition Resistors Carbon composition…

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Passive And Active Electronic Components

In a previous page, we discussed phasors, but we didn’t explore…

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Impedance and Reactance

Impedance and reactance An element in a DC circuit can be described…

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Thermistor

What is a Thermistor? A thermistor is a temperature sensitive…

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Film Capacitor

What are film capacitors? Film capacitors are capacitors which use a…

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Electrolytic Capacitor

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

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AC Power Analysis In Reactive Circuits

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

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About the Authors

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

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Carbon Film Resistor

What is a Carbon Film Resistor? Carbon film resistors are a type of…

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Q factor

Q Factor definition The Q factor of a capacitor, also known as the…

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Electric Charge

What is electric charge? Electric charge is a fundamental physical…

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Understanding Electrical Transformers

AC electrical systems make extensive use of transformers. A…

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Mica Capacitor

What are mica capacitors? Mica is a group of natural minerals. Silver…

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Parasitic Inductance

What is inductance? Electric inductance is a property of all…

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Complex Numbers, Phasors And Phase Shift

The Effect of Phase We saw in the previous page that the voltage…

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Supercapacitor

What are supercapacitors? Supercapacitors are electronic devices which…

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Resistor Noise

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

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Potentiometer

What is a Potentiometer? A potentiometer is a manually adjustable…

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Carbon Composition Resistor

An Introduction to Carbon Composition Resistors Carbon composition…

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Resistor Guide Intro

Welcome to the Resistor Guide! The Resistor Guide will guide you in…

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Dielectric Materials

Dielectric materials Dielectric materials are essentially insulators,…

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Filter capacitor

Filter capacitors Capacitors are reactive elements, which make them…

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Digital Potentiometer

What is a Digital Potentiometer? A digital potentiometer (also known…

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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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Impedance and Reactance

Impedance and reactance An element in a DC circuit can be described…

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Ohm’s Law

What Is Ohm’s Law? Ohm’s law states that the electrical…

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Resistors in Parallel

How to Calculate the Equivalent Resistance for Resistors in Parallel?…

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Power Factor And RMS Explained

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

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PTC Thermistor

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

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Resistor Values

Standard Resistor Values In 1952, the IEC (International…

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Resistor Symbols

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

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