Electricity is all around us. We have electric lights, electric clocks, we have mobilephones, calculators, television, V-recorders, CD-players, MP3-players, radio, computers.
Light it self is an electromagnetic phenomenon, as radio waves are. The colors of the ribbon on the blue sky are they because of electricity.
Cars, planes, trains can only run because of electricity. Horses need electricity because musclecontractions required electricity. Your nervsystem is driven by electricity. Atoms, molecules, all chemical reactions exist because of electricity. You could not see without electricity. Your hard could not beat without electricity, and you could not even thing without electricity.
Webster’s dictionary defines technology as “the practical application of knowledge especially in a particular area” and “a manner of accomplishing a task, especially using technical processes or methods”. The etymology of both words, technology and technical, is the Greek word techne meaning art or skill, maybe even craftsmanship.
The operating principle of the residual current release is basically the detection of an earth fault current, by means of a toroid transformer which embraces all the live conductors, included the neutral if distributed.
Like so many things electrical, the history of electric Christmas lights begins with Thomas Edison. During the Christmas season of 1880, Edison, who had invented the incandescent bulb the previous year, hung strings of electric lights outside his laboratory in Menlo Park, New Jersey.