Electrical metallic tubing (EMT) is a lightweight conduit for encasing electrical cables within a building. Although there are various different types of pipe materials available, this is one of the more popular choices among contractors since it is less expensive than comparable materials. EMT should not be confused with metal plumbing piping, which is used for transporting water under pressure.
The term "electrical tubing" is commonly used to describe flexible, corrugated steel piping that allows the insertion of multiple wires into the wall without need for separate coverings or insulation. This type of wiring is used primarily in commercial buildings, but it can also be found in residential structures if they were built before 1990. The wiring inside EMT provides power to lights, heaters, air conditioners, and other appliances. It is also used to supply lighted signs, music systems, and emergency lighting in offices, factories, schools, etc.
This type of wiring is particularly useful when space is limited because electricians do not have to run multiple lengths of cable through walls or ceilings to reach certain areas of a building. Instead, they will only need to insert the wires into small holes created by drilling or punching in the exterior surface of the wallboard or ceiling paneling. These wires can then be routed out through other similar holes when needed.
The term "conduit" can also refer to any sort of tube used to perform the same job or process. Conduit is commonly utilized in industrial and commercial applications but is uncommon in the household market. For example, water pipes are used to carry water from a source (such as a lake or mountain) to consumers who need water; gas pipes are used to transport natural gas from one location to another; electrical wires are used to transmit electricity from one place to another; and so on.
Conduits are divided into three main categories based on their intended use: internal, external, and protective.
Internal conduits are used within buildings for wiring services. Examples include telephone lines and water mains. Internal cables are used within buildings for television, computer networks, and other similar applications. These types of cables are called "wireways."
External conduits are used outside of buildings for power transmission lines, street lights, fire hydrants, and other similar applications. External cables are called "stub-outs."
Protective conduits are used for covering and protecting objects such as cable TV poles and traffic signals. They provide insulation and protection for underground cables.
To further complicate matters, electrical engineering technology (EET) refers to the applied electrical engineering domain that deals with the hands-on manufacturing, maintenance, and repair of electrical systems and circuitry, which includes working with everything from industrial electronic motors to consumer programmable thermostats. Electrical technology programs typically require several years of full-time study after completing high school or earning a certificate of completion for those who want to go into career paths related to electronics.
Electrical technology programs are found at community colleges and universities across the United States and Canada. Students have the opportunity to earn an associate's degree in as little as one year by taking only 15 to 20 hours of coursework per semester. Many students choose to take advantage of this rapid certification option and remain part time while still gaining valuable experience. Those who want to pursue a bachelor's degree can continue their studies after two years by focusing on specific areas of interest within electrical technology.
Students in electrical technology courses are usually taught how the various parts of electrical circuits work together and how they are connected. They may be required to learn basic information about electricity such as potentials, currents, and voltages, but they will not be taught how to build actual circuits using transistors or how semiconductors work inside computers.
Steel tubing is utilized in a variety of industrial applications, including the conveyance of water, gases, and liquid waste. Steel tubes are a frequent component of industrial machinery, and may be found in conveyor belts, hydraulic lifts, mills, and a variety of other applications. They are also used in construction for plumbing and heating systems.
Steel tubing is particularly useful in those applications where non-ferrous materials are unsuitable, such as where corrosivity or magnetism is an issue. The tubing can be formed into any shape required by its application, and often has superior ductility to iron or stainless steel piping of similar size. This makes it suitable for use in applications where stress relief joints are necessary.
The primary advantage of steel tubing over iron or plastic pipe is its price per foot. Pipe made from steel sheets can be up to 100 times cheaper than that made from iron. This means that low-cost industrial projects can benefit from this cost efficiency.
Another advantage of steel tubing is its durability. Iron and plastic pipes require special treatments to prevent them from deteriorating due to exposure to chemicals or sunlight. By contrast, steel tubing is not only resistant to corrosion but can also be painted or coated with other materials to match a site's aesthetic requirements. This makes steel tubing ideal for applications where aesthetics are important, such as warehouse floors or factory ceilings.
Material that is unsourced may be questioned and deleted. A vacuum tube, also known as an electron tube or valve in British use, or a tube in North American usage, is a device that regulates electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The term "tube" here refers to both the casing and its contents.
Electrical tubes are used in many electronic devices, especially amplifiers and televisions. They were also once common in telephone equipment for amplifying sound signals. Today they are rarely used for this purpose; instead, modern telephones use solid-state components to amplify voice signals.
Telephone circuits used to be made from wire wrapped around iron cores, but these days most telephone circuits use copper wires instead. The old iron cores remain inside most modern telephones to provide some degree of electromagnetic shielding for the delicate copper wires connecting the phone's parts together. These iron cores can cause problems for people who wear magnetic jewelry, so they should be removed if possible.
The first electrical tubes were invented by Thomas Edison's employee Charles Batchelor in 1872. These were glass tubes with a coating on one side that acted as an electrode. When a voltage was applied across the ends of the tube, the interior became electrically hot enough to emit electrons that struck the opposite electrode, creating light.
An electrical device that generates, amplifies, and rectifies electric oscillations and alternating currents, often consisting of a sealed glass bulb holding two or more electrodes. Also known as "an electronic tube" As opposed to a gas or vacuum tube, which has been obsolete for many applications since the advent of the transistor.
Electric tubes were once widely used in radio receivers as detectors for detecting high-frequency signals from remote stations. They are also used in televisions, audio equipment, and other devices that use magnetic recording technology (e.g., tape decks).
The name "electric tube" was originally applied only to those components of radios that used semiconductor diodes instead of vacuum tubes. But because these diode components function much like electrical tubes, they are now usually called electronic tubes or simply tubes. The word "tube" itself means "a glass container with an opening on one side," and this is how most electronic tubes are made today. But early tubes had no special opening, so they must have been very different looking objects.
Vacuum tubes were the first electronic components used in radios. They are still used in some modern radio receivers to amplify very low-level signals from distant stations. But because vacuum tubes are very inefficient energy consumers, they have largely been replaced by solid-state components such as transistors and integrated circuits (ICs) in modern radios.
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