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The study of semiconductor devices and related technology is considered a branch of solid-state electronics. (Full article...)

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Marconi 1909.jpg

Guglielmo Marchese Marconi, GCVO (25 April 1874-20 July 1937) was an Italian inventor, best known for his development of a practical radiotelegraph system, which served as the foundation for the establishment of numerous affiliated companies worldwide. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun, "in recognition of their contributions to the development of wireless telegraphy". While growing up, Marconi had an intense early interest in science, and was especially fascinated by electricity.

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Tesla coil 3.svg
Credit: User:K7jeb, User:Omegatron (vectorization)
Tesla Coil schematic.

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In science and technology, a battery is a device that stores chemical energy and makes it available in an electrical form. Batteries consist of electrochemical devices such as two or more galvanic cells, fuel cells or flow cells. The modern development of batteries started with the Voltaic pile, announced by the Italian physicist Alessandro Volta in 1800.

Formally, an electrical "battery" is an interconnected array of similar voltaic cells ("cells"). However, in many contexts (other than the expression dry cell) it is common to call a single cell used on its own a battery. A battery is a device in which chemical energy is directly converted to electrical energy. It consists of one or more voltaic cells, each of which is composed of two half cells connected in series by the conductive electrolyte.

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Light switch inside explained.jpg
Credit: User:SCEhardt
Inside of a common light switch.

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