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Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles. Electronics is a subfield of electrical engineering which uses active devices such as transistors, diodes, and integrated circuits to control and amplify the flow of electric current and to convert it from one form to another, such as from alternating current (AC) to direct current (DC) or from analog signals to digital signals.

Electronic devices have hugely influenced the development of many aspects of modern society, such as telecommunications, entertainment, education, health care, industry, and security. The main driving force behind the advancement of electronics is the semiconductor industry, which in response to global demand continually produces ever-more sophisticated electronic devices and circuits. The semiconductor industry is one of the largest and most profitable sectors in the global economy, with annual revenues exceeding $481 billion in 2018. The electronics industry also encompasses other sectors that rely on electronic devices and systems, such as e-commerce, which generated over $29 trillion in online sales in 2017. (Full article...)

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Georg Simon Ohm, (March 16, 1789 - July 6, 1854) a German physicist, was born in Erlangen and educated at the university there. His most important finding was Ohm's Law, which he first published in his pamphlet Die galvanische Kette mathematisch bearbeitet, in 1827. This work, the germ of which had appeared during the two preceding years in the journals of Schweigger and Poggendorff, has exerted an important influence on the development of the theory and applications of electric current. Ohm's name was adopted as the SI unit of resistance, the ohm (symbol Ω).

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Ohm's law states that, in an electrical circuit, the current passing through a conductor, from one terminal point to another, is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two terminal points and inversely proportional to the resistance of the conductor between the two terminal points. The SI unit of current is the ampere; that of potential difference is the volt; and that of resistance is the ohm, equal to one volt per ampere.

In mathematical terms, this is written as:


where I is the current, V is the potential difference, and R is a constant called the resistance.

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The Canon EOS 20Da is an 8.2-megapixel semi-professional DSLR camera designed specifically for astrophotography. It was initially announced on February 14, 2005 for release only in Japan. On June 1, Canon announced that the 20Da would be made available worldwide. It is a variant of the Canon EOS 20D. It accepts EF and EF-S lenses.

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