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Monthly Archive for: «July, 2011»

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DC to AC Transfer – Measurement

General transfer capability is essential to the measurement of voltage, current, power, and energy. The standard cell, the unit of voltage which it preserves, and the unit of current derived… Read more

Jul 30, 2011 | Edvard

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 | Edvard

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 | Edvard

Fig. 3.2 Magnetization and hysteresis curves

How Stuxnet (PLC virus) spreads – Part 1

The Stuxnet worm is a sophisticated piece of computer malware designed to sabotage industrial processes controlled by Siemens SIMATIC WinCC and PCS 7 control systems. The worm used both known… Read more

Jul 20, 2011 | Edvard

How Stuxnet (PLC virus) spreads
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