types of electrical measuring instruments ppt

... 31 the electrical properties of the material. Resistance to the flow of current may be undesired—for example, in the case of lead wires and connection cable—or it may be exploited in an electrical ... because of its simplicity. It is, however, only an approx- imation of the physics of electrically conducting materials. Typically, the linear relationship between voltage and current in electrical ... for example, in three of the four quadrants of the i-v characteristic and can therefore act as sources of energy for specific combinations of voltages and currents. An example of this dual behavior...

Ngày tải lên: 19/01/2014, 20:20

... Types of Atomic & Molecular Bonds Types of Atomic & Molecular Bonds Objectives of the class Develop a sense of history of scientific thinking Explain the types of bonds You ... Energy vs. Separation DistanceEnergy vs. Separation Distance a F E    Types of Atomic & Molecular Bonds Types of Atomic & Molecular Bonds Force vs. Separation DistanceForce vs. ... (400 BC) Lots of work done by the alchemists Lavoisier: chemical reaction leads to no net loss or gain of matter. Dalton: concept of atomic mass (1808) Mendelev: periodic table of elements (1869) Moseley:...

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Ngày tải lên: 12/08/2014, 14:20

... !"#"! 5 Types of Pacemakers and the Hemodynamics of Pacing Permanent Pacemaker Types Pacemaker Code ""$...

Ngày tải lên: 24/01/2014, 01:20

... condi- tions), knowledge of the density of one of the carrier types (e.g., of p) allows direct deter- mination of the density of the other (e.g., n = n 2 i /p). Values of n i vary considerably ... semiconductor crystals, the density of such scattering sites is small relative to the density of silicon atoms. As a result, removal of the silicon atoms through use of the effective mass leaves a somewhat sparsely ... overview of many of the semiconductor materials in use. To organize the information, the topic is developed from the perspective of the factors contribut- ing to the electronic behavior of devices...

Ngày tải lên: 25/01/2014, 15:20

... manufacture of electrical equipment, the job site, and the installation of electrical systems. Many of these stan- dards are focused on safety issues, such as the elimination or avoidance of hazards ... owner. Electrical specifications and electrical drawings are integral parts of the contract requirements for the performance of electrical work. Because specifications are a significant part of a ... drawing of a section through the wall of an office warehouse. It provides details of how and where hanger fittings and boxes are to be placed between a column and insulation to support a run of bus...

Ngày tải lên: 25/01/2014, 23:20

... disks store large amounts of data. New PCs feature hard disks with capacities of 10 GB and higher. lesson 9 Review ã List four types of magnetic and four types of optical storage devices. ã Identify ... single speed, and read data at a rate of 150 KBps. (Hard disks transfer data at rates of 5 15 MBps). ã CD-ROM drives now can transfer data at speeds of up to 7800 KBps. Data transfer speeds ... be polarized—given a magnetic chargein one of two directions. ã Each particle's direction represents a 1 (on) or 0 (off), representing each bit of data that the CPU can recognize. ã A disk...

Ngày tải lên: 16/02/2014, 08:20

... our set of categories. Further surveys would be required to validate this idea. The 20 categories of knowledge covered 215 (97%) of the 221 statements of world knowledge in our proofs. Of the ... then x is of type ‘person’.” Stated in this way, these kinds of knowledge look quite dif- ferent. If one reads our proofs from start to finish, the flow of the argument indicates which of these forms ... (condensed) proof. Each line in the proof indicates either a new piece of background knowledge brought to bear, or a modus ponens inference from the information in the text or previous lines of the proof....

Ngày tải lên: 20/02/2014, 05:20

... of thesedimensions of SEScouldbeused tomeasure theSES of highereducationstudents. 4.1 Education The education dimension of SES is usually measured throu gh the level of ... measure of SES provides an indication of the level of disadvantage in a student’scommunity. Whilethismay beconsideredanimportantelement of SES, itisonly oneaspect of anindividual’scircumstancesanditisimportantthatmeasures of SESreflecta range of dimensionswhich ... 2008enrolment data.  Thesecondmeasurebeinginvestigatedistheoutcome of ajointcommittee of DEEWR,ABS and Universities Australia.This committee noted that there was support for the use of parents’educationalattainmentaspart of ameasure of students’SES(UniversitiesAustralia, 2008)....

Ngày tải lên: 20/02/2014, 20:20

... (alternating current) ã DC (direct current). Electrical equipments can run on either of the AC/DC forms of electrical energies. The selection of energy source for equipment depends on its application ... Motor Gen NNSS Generator Motor (a) (b) SS N N N Figure 1.11 Typical cross section and development of an electrical machine 1.2.6 Basic principles of electrical machines In an electrical machine, the currents in all the windings combine ... N 1 = Number of turns in primary N 2 = Number of turns in secondary m φ = Maximum flux in core and f = Frequency of AC input in Hz. 20 Practical Troubleshooting of Electrical Equipment...

Ngày tải lên: 07/03/2014, 08:20

... shown). Analysis of T-DNA insertion mutants and RNAi mutants of A. thaliana homologs of OsRPA70a and OsRPA70b (AtRPA70a and AtRPA70b) A. thaliana was used for genetic analysis of the functions of OsRPA70a ... cloned in Two types of RPA in seed plants T. Ishibashi et al. 3278 FEBS Journal 272 (2005) 32703281 ê 2005 FEBS Two types of replication protein A in seed plants Characterization of their functions ... primers were used to obtain a fragment of 722 bp corresponding to nt 1135– 1857 of the AtRPA70a cDNA (NM_126648), and of 683 bp corresponding to nt 823–1511 of the AtRPA70b cDNA (NM_120884). The...

Ngày tải lên: 07/03/2014, 21:20

... 7 binary relations from the training set of the SemEval-2007 competition, all definitions of which share the re- quirement of the syntactic closeness of the argu- ments. Further, their definitions ... precision compared to the other relation types while using our approach. Table 2 contains some examples of the semantic types we found for each relation. Some of them are quite specific (e.g., Origin-Entity), ... G y i which are generalization types of the argu- ments of a given positive example < x i , y i >. In other words, we perform generalization per relation argument in a form of one positive example...

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Ngày tải lên: 14/03/2014, 14:20

... solve a variety of practical problems. Finally, a third objective of the book is to illustrate, by way of concrete, fully worked examples, a number of relevant applications of electrical engineering ... certain amount of resistance, the magnitude of which depends on the electrical properties of the material. Resistance to the flow of current may be undesired—for example, in the case of lead wires ... presence of electronic devices and instrumentation in all aspects of engineering design and analysis is one of the manifestations of the electronic revolution that has characterized the second half of...

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