The environmental organization Greenpeace has just released its most recent rating of electronics companies that have the best policies regarding the environment. Companies were scored on several aspects that impact the environment. Greenpeace advocates that "the biggest electronics companies must show leadership in tackling climate... more »
Electron microscopy utilizes a focused beam of electrons to create high-resolution images of a target specimen. Whereas light microscopes are restricted in their magnification by the wavelength of photons, electron microscopes are limited by the much smaller wavelength of electrons, thus achieving magnification down to nearly 0.05... more »
Electronic circuit boards from computers, DVD players and other home electronics are not biodegradable. If disposed through ordinary means, they'll end up in landfills and add to the burden on the environment. But if they're recycled, they can be separated into their reusable and non-reusable parts. The reusable parts can be... more »
Electron dot diagrams, sometimes called Lewis dot diagrams, were first used by Gilbert N. Lewis in 1916. These diagrams are used as a shorthand notation to show the number of valence electrons in an atom. More complicated versions can be used to show the bond between different atoms in a molecule. more »
Working on vintage electronics is, surprisingly, not much different from working on modern electronics. The circuits of vintage electronics are probably more simplified compared to today’s complex technology, but the tools needed to repair them are pretty much the same. Here is how to choose tools for restoring vintage electronics. more »
For those who grew up tinkering with computers, audio equipment, and anything else with a...
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A simple circuit may be constructed with the aid of a battery, alligator clips and a component load. It is a straightforward project and requires... more »
When determining the formal charge of a molecule such as CoCl2 (phosgene gas), you need to know the number of valence electrons for each atom and... more »
German engineers Ernst Ruska and Max Knoll of the Technical University of Berlin built the first electron microscope prototype in 1931. In 1938... more »
The Visa Electron debit/credit card is an internationally recognized card available to consumers in Europe, Africa, the Middle East and other... more »
In recent years, the increase in electronics consumption has led to problems as they become obsolete. Filled with toxic chemicals like cadmium,... more »
The age of digital electronics has come to be one of the most significant developments in the history of society. What were once manual and... more »
Electron dot configurations, also called Lewis structures, are used to help scientists build compounds out of chemical elements. For the sake of... more »
The Consumers Reports Green Choices Reuse and Recycling Center notes that 20% of old computers, 30% of broken televisions and 40% of unused cell... more »
A cathode ray tube (CRT) is a vacuum tube in which electrons emitted from an electrode are focused onto a phosphorescent screen. The electrons... more »
Electron microscopes can generally be found in two variations. A transmission electron microscope (TEM) is solely capable of producing... more »
Molecules can be represented empirically as well as structurally. Chemists use the VSEPR (Valence Shell Electron Pair Repulsion) model for... more »
Chlorophyll in the plant's cells absorbs light waves hitting the green portions of the plant. The capturing of the light energy allows the... more »
Scanning electron microscopes (SEM) utilize electrons in place of light beams to achieve both higher magnification and greater clarity and depth... more »
Gold is used in many things including electronics. And, while it is easier to sell gold from scrap rings or bracelets, you can actually turn a... more »
An electronics test technician tests electronic equipment to make sure it functions properly. This person also ensures the smooth running of... more »
Finding the location of an electron is, in principle, almost exactly the same as finding the location of a chair, a car or any other physical... more »
Electronics can provide hours of entertainment and can also dramatically simplify everyday life. If your father has a tendency to purchase the... more »
What can be easier than researching, choosing and buying electronics all from the comfort of your own home? By going to the "Amazon" website you... more »
Calcium chloride is a combination of the elements calcium and chlorine. A calcium chloride molecule is constructed of one calcium atom and two... more »
The electron is a subatomic particle that is known to carry a negative charge. Along with protons and neutrons, these particles make up atoms. The... more »
Electronics is a branch of science and technology that deals with the controlled flow of electrons. The ability to control electron flow is usually applied to information handling or device control. Electronics is distinct from electrical science and technology, which deals with the generation, distribution, control and application of electrical power. This distinction started around 1906 with the invention by Lee De Forest of the triode, which made electrical amplification possible with a non-mechanical device. Until 1950 this field was called "radio technology" because its principal application was the design and theory of radio transmitters, receivers and vacuum tubes.
Most electronic devices today use semiconductor components to perform electron control. The study of semiconductor devices and related technology is considered a branch of physics, whereas the design and construction of electronic circuits to solve practical problems come under electronics engineering. This article focuses on engineering aspects of electronics.
Electronic devices and components
An electronic component is any physical entity in an electronic system used to affect the electrons or their associated fields in a desired manner consistent with the intended function of the electronic system. Components are generally intended to be connected together, usually by being soldered to a printed circuit board (PCB), to create an electronic circuit with a particular function (for example an amplifier, radio receiver, or oscillator). Components may be packaged singly or in more complex groups as integrated circuits. Some common electronic components are capacitors, resistors, diodes, transistors, etc. Components are often categorized as active (e.g. transistors and thyristors) or passive (e.g. resistors and capacitors).
Types of circuits
Circuits and components can be divided into two groups: analog and digital. A particular device may consist of circuitry th read more at » http://en.wikipedia.org/wiki/Electronics
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