The physical phenomena of electricity is a vast subject. This online course takes you through some of the main aspects of electricity and its application. Do you know what sort of current is used in batteries? We start off with an explanation of alternate and direct currents. Both these are key parts of alternate current (AC) theory. In addition, we examine the use of AC voltages and currents functioning all around us. Terms such as waveforms and harmonics will be defined and the computation of average and RMS (root mean square) value will be looked at. Graphical representations and mathematical equations are used to illustrate the concepts of form factor and amplitude. Phasor representation and power of AC circuits is a major part of electrical studies. The methodology used in the application of these concepts will be described.

Moreton, D. P. (1911) Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples. [Chicago, The Reilly & Britton co] [Pdf] Retrieved from the Library of Congress,


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Moreton, David Penn. Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples. [Chicago, The Reilly & Britton co, 1911] Pdf. Retrieved from the Library of Congress, .

THE three books before us suggest an interesting comparison of three points of view from which any applied science can be regarded. Each covers, or attempts to cover, in a more or less suinmary fashion, practically the whole subject of electrical engineering, but as each appeals to an entirely different audience, the difference in method of treatment is necessarily very marked. Mr. Yorke's volume is written for the student who proposes to become an electrical engineer, the genuine professional, whose chief assets must be knowledge and brains. The readers of the Electrician Primers will mostly be found amongst artisans, amongst the class not unjustly distinguished from electrical engineers by the name of electricians, people who require a fair amount of knowledge, but who can get on with a very limited amount of understanding. Finally, Mr. Gibson's book makes its appeal directly to the general public, or to that section of it which shows an intelligent desire to keep abreast of the times and is not content to utilise the advantages of civilisation without some attempt at appreciating the manner in which they are obtained.

Our experimental setup consisted of a silicone polydimethylsiloxane (PDMS) chamber with embedded metallic wires (Figure 1A). The metallic leads were connected to an Agilent E3649A variable power supply and a constant voltage was applied to the chamber for 1 minute. A Fluke 179 multimeter monitored the temperature with a thermocouple lead inserted into the liquid in the chamber. Experiments were conducted using whole human blood, platelet rich plasma (PRP), platelet poor plasma (PPP), and isolated, washed platelets. Additionally, fluorescently labeled fibrinogen (Alexa Fluor 488) was added to the blood product, 5%v/v, to assess fibrin formation.

Our results suggest that direct electrical stimulation promotes clot formation and could potentially lead to a new category of hemostatic therapies that are free from the infectious risks and immune effects that encumber current human or animal-derived agents. With the addition of electrical stimulus, fibrin networks form on average 53% faster than control conditions. We anticipate this concept of applying electricity to different processes in the blood will have significant implications for experimental and clinical hematology.

Uniform electrical fields have been applied to human gingival fibroblasts by means of uniform ionic currents passed through a thin chamber. Cells were observed to align in fields between 0.1 and 1.5 V/mm but did not display directed motion toward the anode or the cathode of the chamber. Statistical analysis of directional data was used to distinguish threshold levels of orientation at low field intensities, to quantify the dependence of alignment on time and field intensity, and to analyze differences between alignment of cells treated with the Ca2+ transport modifiers A23187, verapamil, and lanthanum. Alignment occurred at a steady rate and was dependent in a saturating fashion on field strength. The Ca2+ ionophore A23187 had a significant inhibitory effect on cell alignment in applied electrical fields; however, the Ca2+ channel blockers lanthanum and verapamil did not have a significant effect on alignment.

Electrical Engineering has changed the way people around the world lead their daily lives since the invention of integrated circuit (IC) chips. It is undoubtedly a broad discipline that aims at harnessing electricity and electrical currents for the design of complex systems, from modern computing devices to analog and digital signal processing systems, from wireless broadband telecommunications systems to aerospace data communications, and from power system generation to power transmission distribution.

James Stevens (B.S. Electrical Engineering, '20) started at UW Tacoma in the winter of 2016. In 2018, he applied and was accepted into the electrical engineering program at the School of Engineering and Technology.

The Accreditation Board for Engineering and Technology (ABET) is a non-governmental organization that accredits post-secondary education programs in applied science, computing, engineering, and engineering technology. Students who complete the BSEE program will achieve the following ABET-based student outcomes:

Foundations of electricity: charge, voltage, current, power and energy, computation of power and energy for electrical gadgets and household, simple billing calculations. Electricity supply: definition and characteristics of AC and DC voltages and currents and their applications, calculation of Instantaneous, RMS and Average voltage and current values and their relevance. Transformer: definition and components of a transformer, principle of operation, ideal transformer and characteristics, transformer types and ratings used by utilities in Ghana. AC circuit systems: definition of 1-phase 2-phase and 3-phase circuit systems, voltage and current relationship between the circuit systems, sample voltage drop and line loss calculation for electricity supply from source to destination. Electricity supply: electricity utilities and functional roles, electricity generation sources, hydro power generation process, transmission process, distribution process to users in Ghana. Power factor: definition and relevance, active power, reactive power, and apparent power, calculation of power factor and correction. Electric Motors: components of an electric motor, basic principle of operation, motor types and applications. Electrical Safety: importance of electrical safety, shock current, common sources of hazards, safe practices.

The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry.[7] The piezoelectric effect is a reversible process: materials exhibiting the piezoelectric effect also exhibit the reverse piezoelectric effect, the internal generation of a mechanical strain resulting from an applied electric field. For example, lead zirconate titanate crystals will generate measurable piezoelectricity when their static structure is deformed by about 0.1% of the original dimension. Conversely, those same crystals will change about 0.1% of their static dimension when an external electric field is applied. The inverse piezoelectric effect is used in the production of ultrasound waves.[8]

French physicists Jacques and Pierre Curie discovered piezoelectricity in 1880.[9] The piezoelectric effect has been exploited in many useful applications, including the production and detection of sound, piezoelectric inkjet printing, generation of high voltage electricity, as a clock generator in electronic devices, in microbalances, to drive an ultrasonic nozzle, and in ultrafine focusing of optical assemblies. It forms the basis for scanning probe microscopes that resolve images at the scale of atoms. It is used in the pickups of some electronically amplified guitars and as triggers in most modern electronic drums.[10][11] The piezoelectric effect also finds everyday uses, such as generating sparks to ignite gas cooking and heating devices, torches, and cigarette lighters.

The first demonstration of the direct piezoelectric effect was in 1880 by the brothers Pierre Curie and Jacques Curie.[13] They combined their knowledge of pyroelectricity with their understanding of the underlying crystal structures that gave rise to pyroelectricity to predict crystal behavior, and demonstrated the effect using crystals of tourmaline, quartz, topaz, cane sugar, and Rochelle salt (sodium potassium tartrate tetrahydrate). Quartz and Rochelle salt exhibited the most piezoelectricity.

For the next few decades, piezoelectricity remained something of a laboratory curiosity, though it was a vital tool in the discovery of polonium and radium by Pierre and Marie Curie in 1898. More work was done to explore and define the crystal structures that exhibited piezoelectricity. This culminated in 1910 with the publication of Woldemar Voigt's Lehrbuch der Kristallphysik (Textbook on Crystal Physics),[16] which described the 20 natural crystal classes capable of piezoelectricity, and rigorously defined the piezoelectric constants using tensor analysis.

The use of piezoelectricity in sonar, and the success of that project, created intense development interest in piezoelectric devices. Over the next few decades, new piezoelectric materials and new applications for those materials were explored and developed.

The nature of the piezoelectric effect is closely related to the occurrence of electric dipole moments in solids. The latter may either be induced for ions on crystal lattice sites with asymmetric charge surroundings (as in BaTiO3 and PZTs) or may directly be carried by molecular groups (as in cane sugar). The dipole density or polarization (dimensionality [Cm/m3] ) may easily be calculated for crystals by summing up the dipole moments per volume of the crystallographic unit cell.[18] As every dipole is a vector, the dipole density P is a vector field. Dipoles near each other tend to be aligned in regions called Weiss domains. The domains are usually randomly oriented, but can be aligned using the process of poling (not the same as magnetic poling), a process by which a strong electric field is applied across the material, usually at elevated temperatures. Not all piezoelectric materials can be poled.[19] 2351a5e196

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