ⓘ Free online encyclopedia. Did you know? page 24



                                               

Amazon Kindle

Amazon Kindle is a machine for reading electronic books. The Kindle is designed by Lab126, a part of the Amazon.com company. The first Kindles were sold in the United States on November 19, 2007. Six hardware devices, known as "Kindle", "Kindle 2 ...

                                               

Analog signal

An analog or analogue signal is any continuous signal. The difference from a digital signal is that also very small fluctuations in the signal are meaningful. When one speaks of analog one often means an electrical context, however mechanical, pn ...

                                               

Bandwidth (signal processing)

Bandwidth is used to measure electronic and other types of communication. This includes radio, electronics, and other forms of electromagnetic radiation, Bandwidth is the difference between the electronic signal having highest-frequency and the s ...

                                               

Biasing

Biasing in electronics is using specific voltages and/or currents at points of an electronic circuit to set an appropriate operating point. The operating point of a device, also known as bias point, is the point that shows the direct current, col ...

                                               

Bipolar junction transistor

A bipolar junction transistor is a type of transistor that relies on the contact of two types of semiconductor in order for it to work. BJTs can be used as amplifiers, switches, or in oscillators. BJTs can be found either on their own, or in larg ...

                                               

Blue box

A blue box is a device that someone could use to make free telephone calls. It worked by playing back the same sounds that the telephone company employees used to program their equipment. The most famous person to use a blue box was John Draper, ...

                                               

Boolean algebra

In mathematics, Boolean algebra is an algebra for binary digits. It is equipped with three operators: conjunction, disjunction and negation. It uses normal math symbols, but it does not work in the same way. It is named for George Boole, who inve ...

                                               

Breadboard

A breadboard is an electronic tool which can be used to test electrical circuits. Instead of using soldering to connect wires and components together, they can be stuck into the holes of the breadboard. It has metal strips inside that will connec ...

                                               

Cartridge (electronics)

A cartridge means an object that adds different functions or content to an electronic device, or that refills something the device needs. A cartridge is easy to use. For example, an ink cartridge is easier to use than a bottle of ink. This is bec ...

                                               

Chassis

A chassis consists of a framework that supports an inanimate object. This is much like an animals skeleton, for example in a car.

                                               

Cold cathode

A cold cathode is a cathode that is not heated directly by a filament or element, although a cold cathode can heat up during use as a side effect of normal current flow. The term cold cathode is often used to refer to cold cathode fluorescent lam ...

                                               

Consumer electronics

Consumer electronics or home electronics are electronic equipment intended for use by everyday use, typically in private homes. Some categories of consumer electronics include telephones, audio equipment, televisions, calculators, and playback an ...

                                               

Contactless smart card

A contactless smart card is a kind of smart card with integrated circuits that can process and save data. Most cards are as big as a credit card. They can receive information which is processed and delivered through radio. There are two main kind ...

                                               

Cutoff frequency

The cutoff frequency is the minimum frequency that is required for the emission of electrons from a metallic surface, due to incident radiation. Below the cutoff frequency, the phenomenon of the photoelectric effect stops altogether. When electro ...

                                               

Device controller

A device controller is a system that handles the incoming and outgoing signals of the CPU. A device is connected to the computer via a plug and socket, and the socket is connected to a device controller. Device controllers use binary and digital ...

                                               

Digital

A digital system is a system that stores data in a discrete way. The opposite is an analogue system, which stores the data in a continuous way. Usually, digital systems store the information in a binary way; that is, every bit of information can ...

                                               

Digital audio

Digital audio is sound which has been turned into a computer file. Digital audio files can be played on MP3 players, computers, smartphones, and more. Digital audio may be uncompressed, such as CDs, losslessly compressed, such as FLAC files, or l ...

                                               

Digital camera

A digital camera is a camera that stores pictures in electronic memory instead of film. Because of this, a digital camera can hold many more pictures than a traditional film camera. A digital camera can sometimes hold hundreds or thousands of pic ...

                                               

Digital electronics

Digital Electronics is a type of electronics. These make use of "boolean logic" and "discrete signal electronics" for electronics, devices, and equipment. Examples of such devices are computers, information appliances, digital cameras, digital te ...

                                               

Digital light processing

Digital light processing projector is a kind of video projector. It uses small mirrors that reflect light. The mirrors can be moved to either reflect light or not reflect light. The mirrors move very fast. When the mirror reflects light more ofte ...

                                               

Dry cell

Mercury cells Alkaline cells Primary cells Silver oxide cell Zinc-carbon cells, also known as Leclanche cells Lithium cells Nickel-cadmium cell Secondary cells Lithium-ion cell Nickel metal-hydride cell Primary cells are not rechargeable. They ha ...

                                               

E-book reader

An e-reader, also called an e-book reader or e-book device, is a mobile electronic device that is designed primarily for the purpose of reading digital e-books and periodicals. Any device that can display text on a screen may act as an e-reader, ...

                                               

E-cigarette

An electronic cigarette is a cigarette substitute. It gives small amounts of the chemical nicotine without the tobacco or other chemicals from real cigarettes. The main substances making up in the liquid in the e-cigarettes are nicotine, propylen ...

                                               

Electric blanket

An electric blanket is a blanket with electric heating. The first electric blanket was invented in 1912 by an American inventor named Samuel Irwin Russell. Some modern "low voltage" electric blankets have thin carbon fiber wires and work on 12-24 ...

                                               

Electrical resistance

The electrical resistance of an electrical conductor is a measure of the difficulty of passing an electric current through a substance. It explains the relationship between voltage and the current. With more resistance in a circuit, less electric ...

                                               

Electronic engineering

Electronic engineering is an engineering discipline that investigates the use of electricity and magnetism. Electronic engineers are concerned with such processes as; the use of radio waves, the design of electronic circuits, the design of comput ...

                                               

Electronic tagging

There are special electronic devices, that can be permanently attached to a person. These devices are called electronic tags. Using wireless or mobile phone networks, it is then possible to monitor where the person is, all the time. The device ca ...

                                               

Electronic waste

Electronic waste or e-waste is electronics that have been discarded. This includes any electronics e.g. computers, power tools and etc. E-waste is a concern for every country in the 21st century. Because of Moores law, the rule that states transi ...

                                               

Galvanic isolation

Galvanic isolation means separating two electrical structure from each other. One way to do it is to use relay, another way to do it is to use opto-isolator. Also transformer makes galvanic isolation.

                                               

Giant magnetoresistance

Giant magnetoresistance is a very small magnetic effect found in thin layers of iron and other materials. It is used to read and write information in hard drives. The GMR effect can be measured when a magnet is used to change the flow of electric ...

                                               

Home computer

A home computer is the name given to early personal computers made in the 1980s and 1990s that could be plugged into a television set. They were used for playing video games and doing school work and were usually owned by children.

                                               

Impedance matching

In electronics, impedance matching is about connecting two electrical systems of which the impedances differ. Some audio devices use transformers for impedance matching. The concept of impedance matching is also used in optics.

                                               

Insulator (electricity)

An electrical insulator is a material that does not easily allow flow of electricity through an electric current. Materials typically used to insulate include rubber, plastic and glass. In transformers and electric motors, varnish is used. Insula ...

                                               

Light bulb

A light bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes. Billions are in use, some even in outer space. Earl ...

                                               

Molex connector

A Molex connector is a standard connector, which is used on electronic circuit boards. It is also used in many Personal computers, where it ofen transmits power. It is a pin and socket design. Originally, these connectors where manufactured by th ...

                                               

Noise (electronics)

In electronics, noise is a random fluctuation in an electrical signal. This happens in all electronic circuits. Noise made by electronic devices varies greatly. In communication systems, noise is an error or random disturbance of useful informati ...

                                               

Photodiode

A photodiode is a light sensitive semiconductor. It is a type of photodetector capable of changing light into either current or voltage, depending upon the mode of operation. If the anode and cathode leads of a photodiode are joined together by a ...

                                               

Pickup (music)

A pickup is a device that captures mechanical vibrations and converts them to an electrical signal which can be amplified and recorded. There are two main types of pickups. While piezo pickups are more common on acoustic guitars, and magnetic on ...

                                               

Power spectrum

The power spectrum of a signal is the power or more simply the energy of the signal at each frequency that it contains. It can also be considered as the range or spectra of energy or power of the given signal derived from the signals range of fre ...

                                               

Printed circuit board

A printed circuit board is a board made for connecting electronic components together. These are used in almost all computers and electronics today. The "card" is made of a material that does not conduct electricity, usually fiberglass. Usually c ...

                                               

Radar

Radar is a machine that uses radio waves for echolocation to find objects such as aircraft, ships, and rain. The basic parts of a radar are: The antenna directs the radio waves. The receiver measures the waves which are bounced back by the object ...

                                               

Radiation hardening

Radiation hardening is the designing of electronic parts and systems so they can withstand the damage done by ionizing radiation. Such radiation occurs in outer space and when flying at high altitudes in the Van Allen radiation belts. They also o ...

                                               

Radio control

Radio control is controlling vehicles by radio wave signals. It is often used for making models of cars, boats, helicopters and airplanes move on their own like real ones. For controlling models, an operator uses a transmitter that has the models ...

                                               

Raytheon

Raytheon Company is an American defense contractor and industrial corporation. It makes military weapons and commercial electronics. It is the worlds largest producer of guided missiles. Raytheon was set up in 1922.

                                               

Red box

A red box is a device that people used illegally in the 20th century to make free telephone calls at a payphone. It worked by playing back the same sounds that the payphone sends to the phone company when coins are put into it.

                                               

Relay

A relay is an electromagnetically operated switch. It was invented in the 19th century to make electric telegraph signals go farther. Nowadays relays control circuits with low-voltages. Many machines use them, including vehicles and electronics.

                                               

Remote control

A remote control is a device used to issue commands from a distance to televisions, DVD players, doorbells and so on. A remote controller does not have a wire and can be held by hand. It has buttons for volume, changing television channels and mo ...

                                               

Semiconductor

A semiconductor is a material that in some cases will conduct electricity but not in others. Good electrical conductors, like copper or silver, easily allow electricity to flow through them. Materials that block the flow of electricity, like rubb ...

                                               

Signal (electrical engineering)

In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying quantity. The concept is broad, and hard to define precisely. Definitions specific to subfields are common. For example ...

                                               

Solder

Solder is a metal or alloy that melts at a low temperature. There are two types of solder; soft solder and hard solder. Soft solder melts easily with soldering irons and is used for electronics and electrical work. Hard solder melts at a higher t ...

Free and no ads
no need to download or install

Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

online intellectual game →