In 1877, Thomas Edison was working on a machine that would transcribe telegraphic messages through indentations on paper tape which could later be sent over the telegraph repeatedly. Because of this, Edison speculated that a telephone message could also be recorded in a similar way. Edison made a sketch of his desired machine and gave it to his mechanic, John Kruesi, to then build. After Kruesi built the machine now known as a Phonograph, in a supposed 30-odd hours, Edison immediately tested out this machine by speaking into the mouthpiece, "Mary had a little lamb." When the machine played his words back to him, Edison knew he was onto something groundbreaking.
What is electromagnetism? Merriam-Webster states that “electromagnetism is magnetism developed by a current of electricity.” An alternative definition suggests that electromagnetism is a fundamental physical force that is responsible for interactions between charged particles which occur because of their charge. To fully understand how electromagnetism affects us, it is important to understand the basic foundation of electromagnetism. The field of electromagnetism was only six years old when Henry began teaching at the Albany Academy in New York. Danish scientist Hans Christian Oersted had discovered in 1820 that an electrical current in a wire from a battery caused a nearby compass needle to deflect.
Thomas Edison began creating electric systems which marked the beginning of the age of electricity (Bellis para 15). In order to make a power station, Edison’s power station had four essential elements: a central generation that is reliable, effective distribution, a triumphant final use, and a decent asking price (Bellis para 16). Edison’s first incandescent systems, however, had complications; they were being used in celebrated occasions like the “Paris Lighting Exhibition” and the “Crystal Palace” located in London (“Thomas”... History para 8). In 1880, Edison embarked to create a company that could give electricity to light and power cities of the globe (“Thomas”... Biography para 17).
The photoelectric effect was also explained by Albert Einstein in 1905 for which he received the Nobel Prize in Physics in 1921. In 1946, Russell Ohl patented the modern junction semiconductor solar cell, which was discovered while working on the series of advances that would lead to the transistor. Chapin was the first to develop the highly efficient solar cell, Fuller and Pearson in 1954 using a diffused silicon p-n junction. In the last four decades, eccentric progress has been made, along with Megawatt solar power generating plants which are now been
Anode was attached to iron electrode and cathode was attached to copper electrode of voltmeter to measure a voltage. New filter paper was soaked to the KNO3 solution. One side of the filter paper was put to the solution of CuSO4, the second side of the filter paper was put to the FeSO4 solution. Voltage was
However the man-made radiofrequencies make a very special case. This is so because in the latter there is a carrier radiofrequency wave, typically 1800-2400 GHz, and pulse-modulated over it is the secondary information wave, which carries audio, text and video data packages. These are called radiofrequency electromagnetic fields (RF EMFs) or
The resistance decreases drastically when light falls on it and increases when the light is moved away from it. They are made up of semiconductor materials (usually cadmium sulphide), having no p-n junction but with a high resistance. The input from the LDR goes
When the model is not applicable, the laws do not apply. KCL, in its usual form, is dependent on the assumption that current flows only in conductors, and that whenever current flows into one end of a conductor it immediately flows out the other end. This is not a safe assumption for high-frequency AC circuits, where the lumped element model is no longer applicable.  It is often possible to improve the applicability of KCL by considering "parasitic capacitances" distributed along the conductors.  Significant violations of KCL can occur even at 60 Hz, which is not a very high frequency.
Nikola Tesla In Smiljan, Croatia, which at the time belonged to the Austrian Empire, Nikola Tesla was born. He was born the 10th of July 1856 in an educated family. His father was an orthodox priest, and his mother was an inventor. Tesla were obviously inspired to follow his mother’s feet. Today reckoned as one of the most inspiring and aspiring scientists of all times, especially in the fields of electricity.
COMPANY PROFILE Motorola Inc. was founded on 25th September, 1928 in Schaumburg, Illinois, United States. It was an American multinational, founded by Galvin brothers, Paul and Joseph. It was initially named Galvin Manufacturing Corporation. After having lost $4.3 billion from 2007 to 2009, the company was divided into two independent public companies, Motorola Mobility and Motorola Solutions on January 4, 2011. The company's first products were battery-eliminators, devices that enabled battery-powered radios to operate on household electricity.