Electrical Lectures
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 | By Edvard Csanyi
Electrical Lectures
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 | By Edvard Csanyi
Electric Motor
Sizing The DOL Motor Starter Parts (Contactor, Fuse, Circuit Breaker and Thermal Overload Relay)
Calculate size of each part of DOL motor starter for the system voltage 415V, 5HP three phase house hold application induction motor, code A, motor efficiency 80%, motor RPM 750,… Read more
Sep 11, 2013 | By jiguparmar
Electrical Lectures
Electrical Thumb Rules You MUST Follow (3)
Continued from second part: Electrical Thumb Rules You MUST Follow (Part 2) For Motor Size of Capacitor = 1/3 Hp of Motor ( 0.12x KW of Motor) For Transformer <… Read more
Sep 02, 2013 | By jiguparmar
Electrical Lectures
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 | By jiguparmar
Electrical Lectures
Electrical Thumb Rules You MUST Follow (1)
Cable Capacity Current Capacity of Equipment Earthing Resistance Minimum Bending Radius Insulation Resistance Lightning Arrestor Transformer Diesel Generator Current Transformer Quick Electrical Calculation For Cu Wire Current Capacity (Up to… Read more
Aug 23, 2013 | By jiguparmar
Electrical Lectures
Development of a Sine-Wave Output In AC Generator
The elementary AC generator (Figure 1) consists of a conductor, or loop of wire in a magnetic field that is produced by an electromagnet. The two ends of the loop are… Read more
Jul 08, 2013 | By Edvard Csanyi
Electric Motor
Three Phenomenons In The Iron Of AC Machines
Most of our practical AC machines (motors, generators ad transformers) depend heavily on the magnetic field for operation. The core iron of the machine provides a path for the magnet… Read more
May 29, 2013 | By Edvard Csanyi
Electrical Lectures
How to Determine Correct Number of Earthing Electrodes (Strips, Plates and Pipes) – part 1
Number of Earthing Electrode and Earthing Resistance depends on the resistivity of soil and time for fault current to pass through (1 sec or 3 sec). If we divide the… Read more
Apr 05, 2013 | By jiguparmar
Electrical Lectures
The Rheostat In Few Simple Words
A variable resistor can be made from a wirewound element, rather than a solid strip of material. This is called a rheostat. A rheostat can have either a rotary control… Read more
Mar 20, 2013 | By Edvard Csanyi
Electrical Lectures
Super Capacitors – Different Than Others (part 1)
Capacitors store electric charge. Because the charge is stored physically, with no chemical or phase changes taking place, the process is highly reversible and the discharge-charge cycle can be repeated over… Read more
Feb 23, 2013 | By sravankumarpadala
Electrical Lectures
Water-and-Pipe Analogy for Ohm’s Law
Ohm’s Law also makes intuitive sense if you apply it to the water-and-pipe analogy. If we have a water pump that exerts pressure (voltage) to push water around a ”circuit” (current)… Read more
Aug 15, 2012 | By Edvard Csanyi
Electrical Lectures
Electric Shock Current, Where Does It Go?
As we’ve already know, electricity requires a complete path (circuit) to continuously flow. This is why the shock received from static electricity is only a momentary jolt: the flow of… Read more
Aug 13, 2012 | By Edvard Csanyi
Electrical Lectures
Fundamental Concepts of Insulation Testing
Probably 80% of all testing performed in electrical power systems is related to the verification of insulation quality. This technical article briefly describes the fundamental concepts of insulation testing including… Read more
Jul 07, 2012 | By Edvard Csanyi
Electrical Lectures
Voltage vs. Current in a Resistor, Capacitor or Inductor
Elements in an electrical system behave differently if they are exposed to direct current as compared to alternating current. For ease of explanation, the devices have often been compared to… Read more
Jul 03, 2012 | By Edvard Csanyi
