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Archive: Category «Energy and Power»

Energy and Power

Virus-Powered Battery

Engineers at MIT (Massachusetts Institute of Technology) have figured out a way to deal with virus that is better than just killing them: they’re putting them to work. The researchers… Read more

Sep 16, 2011 | By Bipul Raman

An array of microbattery electrodes
Energy and Power

Ohm’s Law – The Resistance

It is intuitive that voltage and current would be somehow related. For example, if the potential difference between two ends of a wire is increased, we would expect a greater… Read more

Sep 02, 2011 | By Edvard

Megger device
Energy and Power

Surge arrester types and auxiliary equipment

Nearly 100 years ago, electrode gaps (rod, sphere, or pipe) were used to limit overvoltages on equipment (Sakshaug, 1991). Some of these systems, particularly pipe gaps, may still be in… Read more

Aug 25, 2011 | By Edvard

Lightning arrestors being installed at Kingston sub-station in 1928. Photo: ACTEA.
Energy and Power

How to save electrical energy at home

In our home we use lot of electrical equipment like TV, Freeze, Washing machine, Mp3 player, music system, computer laptop. But we have not adequate knowledge for how to use… Read more

Aug 23, 2011 | By jiguparmar

How to save Electrical energy at Home
Energy and Power

Autotransformers in few words

It is possible to obtain transformer action by means of a single coil, provided that there is a “tap connection” somewhere along the winding. Transformers having only one winding are… Read more

Aug 19, 2011 | By Edvard

Autotransformers in few words
Energy and Power

Applications and forms of differential relays

Differential relays take a variety of forms, depending on the equipment they protect. The definition of such a relay is “one that operates when the vector difference of two or… Read more

Aug 15, 2011 | By Edvard

ABB Residual Current Breaker with Overload Protection RCBo
Energy and Power

Whole-House Protection Strategy

No single SPD (Surge Protection Strategy) can protect all the equipment in a residence from all causes of electrical surges. Instead, a whole-house protection strategy, consisting of point-of-entry and point-of-use… Read more

Aug 13, 2011 | By Edvard

SIEMENS - Whole-House Protection Strategy
Energy and Power

Principles for Controlling Harmonics

Harmonic distortion is caused by nonlinear devices in the power system. A nonlinear device is one in which the current is not proportional to the applied voltage. Harmonic distortion is… Read more

Aug 05, 2011 | By Edvard

Variation of the voltage THD over a 1-week period
Energy and Power

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 | By Edvard

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


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