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Archive: Category «Energy and Power»

Energy and Power

Resistive heating explained in details

Whenever an electric current flows through a material that has some resistance (i.e., anything but a superconductor), it creates heat. This resistive heating is the result of “friction,” as created… Read more

Jul 27, 2011 | By Edvard

Energy and Power

Materials with magnetic properties

All materials have magnetic properties. These characteristic properties may be divided into five groups as follows: Diamagnetic Paramagnetic Ferromagnetic Antiferromagnetic Ferrimagnetic Only ferromagnetic and ferrimagnetic materials have properties which are… Read more

Jul 26, 2011 | By Edvard

Fig. 3.2 Magnetization and hysteresis curves
Energy and Power

Fire Protection Measures

The measures to mitigate or lessen fire hazards are normally called “fire protection measures”. The National Fire Protection Association NFPA (U.S. organization charged with creating and maintaining minimum standards and… Read more

Jul 13, 2011 | By Edvard

Fire Protection Measures
Energy and Power

Generator tripping as stability control

Generator tripping is an effective (cost-effective) control especially if hydro units are used. Tripping of fossil units, especially gas- or oil-fired units, may be attractive if tripping to house load… Read more

Jul 06, 2011 | By Edvard

Axial flow francis hydraulic hydro-turbine generator set
Electronics

Designing Raw DC Power Supplies

Every type of electrical or electronic apparatus needs a source of electrical energy to function. The source of electrical energy is called the power supply. The two main classifications of… Read more

Jul 03, 2011 | By Sa'ad Eddin

Designing Raw DC Power Supplies
Energy and Power

Fuel cells in power section

In 1839, a British Jurist and an amateur physicist named William Grove first discovered the principle of the fuel cell. Grove utilized four large cells, each containing hydrogen and oxygen,… Read more

Jul 01, 2011 | By Edvard

The Polymer Electrolyte Membrane (PEM) fuel cells
Energy and Power

Who was James Prescott Joule?

James Prescott Joule was born on Christmas Eve 1818 into a wealthy Salford brewing family. A sickly child, he was tutored at home where he indulged his fascination for electricity… Read more

Jun 27, 2011 | By Edvard

James Prescott Joule
Energy and Power

Thumbs down to the nuclear energy

Although for decades the arguments against nuclear power have been –and still are- strong and valid, there is an increasing group of nuclear companies supported by scientists and politicians, who… Read more

Jun 15, 2011 | By Edvard

Thumbs down to the nuclear energy
Energy and Power

How contactor controls an electric motor?

When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor. Contactors typically have multiple contacts, and… Read more

Jun 01, 2011 | By Edvard

Control of electric motor with contactor
Energy and Power

Technology future – The cost of inaction

Without new thinking on technology intervention, the future looks bleak. Unless the role of technology in the global economy is reconsidered, we risk becoming powerless to feed a growing population,… Read more

May 25, 2011 | By Edvard

Technology future - The cost of inaction
Electronics

ESD – Electro Static Discharge

An increasing problem today with the use of more and more electronic equipment in our systems is the Electro Static Discharge (ESD). The main source of the problem is the… Read more

May 23, 2011 | By Edvard

Printed Circuit Board (PCB)
Energy and Power

Testing of UPS devices

The purpose of electrical testing on systems and their components is two-fold. The first is to check the installation of the equipment and perform component and systems tests to ensure… Read more

May 15, 2011 | By Edvard

Testing of UPS devices


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