Reading time: 2 minute Electrotechnics has as object of study the technical applications of electrical and magnetic phenomena. These applications can be: general (such as: electrical measuring devices, electric drive motors, electric lighting installations, electrothermal installations, etc.) or specific to a certain technological process.
Reading time: 2 minute What is electricity? Electricity is the name of something that no one has ever seen and whose nature is a mystery. You might ask, but don't we feel the electricity when we get a shock and we don't see it when it flashes sometimes? And the answer is no. We never see, feel or hear electricity.
Reading time: 2 minute The book presents the perspective of electricity and its applications, from the '50s. This textbook, which uses as a model of guidance for the theoretical part, the physics textbook written by the Soviet authors A. Bacinski and S. Iliascenko was intended to introduce students of vocational schools in all branches of application of electricity, this field of technique both of special significance for the construction of socialism.
Reading time: 5 minute The electrical appliances have a relatively complex construction, having in their composition all the following elements: current conducting paths, forming the electrical circuits of the appliance; insulating parts, which ensure the insulation of the current paths between them and the table; various mechanical elements (often moving); protection and support housing of the assembly.
Reading time: 2 minute The work was and still is a practical help to ensure the normal operation of the electrical installation of cars and to reduce defects and therefore the downtime required to remove them, thus facilitating the work of the driver.
Reading time: 3 minute Any rotating electric machine is an electromechanical converter, which transforms electrical energy into mechanical energy (electric motor) or which transforms mechanical energy into electrical energy (electric generator). Electromechanical conversion (in one direction or another) is done through the magnetic field.
Reading time: 3 minute The main purpose of this paper is to expose in a form as accessible as possible how to perform maneuvers in electrical installations to reduce the time to perform maneuvers (stagnation in the use of electric machines, installations, etc.) necessary for technological processes, such as and for the prevention of technical or accidental work incidents.
Reading time: 3 minute The paper presents problems regarding the construction, installation, operation and maintenance of low voltage electrical distribution networks with twisted insulated conductors. This type of network represented in 1980 a new low voltage electricity distribution system that used insulated conductors with plastics (poly-vinyl chloride), twisted in the beam, instead of uninsulated conductors.
Reading time: 2 minute The relative and absolute methods of locating the defects are analyzed: induction method, loop measurement method, capacitive method, acoustic method, pulse or ecometric methods, oscillating discharge method, method of locating defects caused by corrosion phenomena. There are also exposed some new methods (since 1976), less applied in our country: methods of locating partial discharges, the standing wave method.
Reading time: 2 minute Did you know that ...? Are oscilloscopes devices that allow either observing on a screen or photographing the shape of the variation curve of time-varying sizes, in general the curves of alternating periodic currents and voltages?