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Archive: Category «Electrical Lectures»

What can a PLC do? Why do we use them?

“PLC” means “Programmable Logic Controller”, that’s clear. The word “Programmable” differentiates it from the conventional hard-wired relay logic. It can be easily programmed or changed as per the application’s requirement…. Read more

Jul 15, 2015 | Edvard

What can a PLC do? Why do we use them? (on photo: SIEMENS PLC Simatic S7-1500; credit: totallyintegratedautomation.com)

4 Main Means For The Generation Of Reactive Power

The four main means for the generation of reactive power are: synchronous alternators, synchronous compensators (SC), static var compensators (SVC) and banks of static capacitors. Contents Synchronous alternators Synchronous compensators… Read more

Jun 29, 2015 | Edvard

4 Main Means For The Generation Of Reactive Power

Back To School – Let’s Calculate Current I3

Referring to the following circuit, calculate direct current I3: Using Kirchhoff’s laws; Using nodal analysis; Applying Thévenin’s theorem at nodes A and B. – KCL stands for Kirchhoff’s Current Law… Read more

Apr 10, 2015 | Edvard

Miniature Circuit Breakers (MCBs) For Beginners

This technical article focuses on the widely used miniature circuit breakers rated for 240 V or less. These are smaller and lower-rated versions of industrial-grade molded-case circuit breakers rated for… Read more

Jan 26, 2015 | Edvard

Heat vs. Current in a Resistor

It is converted from one form to another. One of the most familiar forms of energy is heat. When a current (I) is forced through a resistor (R) by applying… Read more

Oct 04, 2013 | Edvard

Heat vs. Current in a Resistor (photo by Karen Blaha via Flickr)

What Is a Good Ground Resistance Value?

The goal in ground resistance is to achieve the lowest ground resistance value possible, that makes sense economically and physically, when contacting the earth, also known as the soil/ground rod… Read more

Oct 02, 2013 | Edvard

What Is a Good Ground Resistance Value?

Electrical Thumb Rules You MUST Follow (2)

Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 For Sinusoidal Current: Peak Factor = Max… Read more

Aug 28, 2013 | jiguparmar

Electrical Thumb Rules You MUST Follow (Part 2)


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