Electrical Engineering Terms P

Power Supply A transformer and rectifier circuit are encased together to supply a lower control voltage. Programmable Logic Controllers An industrial computer that is used to control and execute real-world functions based on the programmed logic. Power Supply Provides power to the PLC and converts the incoming powers to various …

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Electrical Engineering Terms R

Rebar. A contraction of the term reinforcement bars, which are half-inch wrought-iron rods suspended in poured concrete to give it added strength. Rated Load. The torque value of the connected load that occurs when the horsepower requirements of the driven load equate to the horsepower rating of the motor and …

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Electrical Engineering Terms S

Sealtight. The trade name for liquid-tight flexible metallic conduit. Semiconductor. A name was given to a group of materials or to compounds of these materials that are neither good insulators nor good conductors of electricity. Because of their four valence electrons (free electrons in the outer shell of the atom), …

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Electrical Engineering Terms T

Timer A relay that will delay the switching of the contacts by a predetermined time. Totally Enclosed Fan Cooled (TEFC). Normally abbreviated to the acronym TEFC, this term describes motor enclosures with the end bells and the cylindrical motor housing sealed to prevent the entrance of moisture or dirt. Often …

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Electrical Engineering Terms U

Ufer ground. Name after the man who invented and tested it, a Ufer ground is a grounding electrode consisting of at least 20 feet (6 m) of 1/2-inch (13 mm) rebar (either a continuous single bar or shorter lengths tied-wired together) or of at least 20 feet of wire-size 4 …

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Electrical Engineering Terms V

Variable Frequency Drive A technology where the rotational speed of an electric motor is controlled or varied electronically. Varying Duty. If an electric motor is nameplate-rated with this type of duty cycle, it is rated to operate at loads, and for intervals of time, both of which may be subject …

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Electrical Engineering Terms W

Wire-Wound Rotor (Wound-Rotor Motor or just Wound Rotor). As compared to a squirrel-cage rotor of an electric motor in which aluminum is cast over a steel rotor frame in a mold, the armature circuit of this rotor consists of preformed wraps of insulated wire (windings) similar to the field windings …

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Purpose of Grounding the Utility Power Distribution

fig 1 The static ground wire in the 3-phase electrical utility power transmission-distribution grid

The transfer of electrical power within the electrical-utility power transmission/distribution grid is normally at high voltage (high tension) to reduce the transmission losses (line losses) along the miles of cable that must be installed between the generating plants and the many cities, commercial and industrial sites, and suburban, as well …

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Reversing Three Phase Induction Motors

Reversing Three Phase Induction Motors

Three phase induction Motor rotation can be reversed by changing any two of the three lines feeding power to the motor. It is common standard practice to switch line 1 and line 3. When the motor needs to be run in a clockwise and a counterclockwise rotation, a reverse starter …

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Cloud Computing Security: Issues and Challenges

Cloud Issues

Cloud Computing Security Issues Just as many companies and organizations are attentive and responsive to security concerns within their private networks, there are also security concerns when moving to a cloud environment. One of the biggest security issues that cloud service providers must address is access. The question facing service …

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7 Layers of OSI Model and Their Functions

osi model

OSI Model The structure of the Internet is modeled on the Open Systems Interconnection (OSI) model. The OSI model is a framework used for all communications in the cloud. The OSI model represents the interfaces and protocols used to communicate between devices. Every network device must adhere to the rules …

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PLC Scan Cycle | PLC Programming Software

As there are many PLC manufacturers, there are as many software programming packages. Each manufacturer developed their own software with no set standards other than it must follow relay ladder logic so that technicians could easily be trained without having to be software engineers. Two terms describe PLC software; open …

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