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Portal:Electronics

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The field of electronics is a branch of physics and electrical engineering that deals with the emission, behaviour and effects of electrons using electronic devices. Electronics uses active devices to control electron flow by amplification and rectification, which distinguishes it from classical electrical engineering, which only uses passive effects such as resistance, capacitance and inductance to control electric current flow. (Full article...)

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This 90-foot (27m) diameter radar installation monitors the northern Alaskan sky.

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Hans Christian Ørsted (August 14, 1777 – March 9, 1851) was a Danish physicist and chemist, influenced by the thinking of Immanuel Kant. He is best known for discovering the relationship between electricity and magnetism known as electromagnetism. In April 1820 he noticed a compass needle deflected from magnetic north when the electric current from the battery he was using was switched on and off. This deflection convinced him that magnetic fields radiate from all sides of a live wire just as light and heat do. The CGS unit of magnetic induction (oersted) is named in honor of his contributions to the field of electromagnetism.

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Electromagnetism is the physics of the electromagnetic field; a field encompassing all of space which exerts a force on particles that possess the property of electric charge, and is in turn affected by the presence and motion of those particles. The magnetic field is produced by the motion of electric charges, i.e. electric current. The magnetic field causes the magnetic force associated with magnets.

The term "electromagnetism" comes from the fact that electrical and magnetic forces are involved simultaneously. A changing magnetic field produces an electric current (this is the phenomenon of electromagnetic induction, which provides for the operation of electrical generators, induction motors, and transformers). Similarly, a changing electric field generates a magnetic field. Because of this interdependence of the electric and magnetic fields, it makes sense to consider them as a single coherent entity — the electromagnetic field.

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The Learjet 60 is a private jet manufactured by Bombardier Aerospace. It is an improved version of the Learjet 55, with a longer fuselage and more powerful engines. It first flew in June 1991 and received FAA certification in January 1993. A new Learjet 60 costs around $11 million, although used aircraft can be purchased for around $7 million.

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