Counter-Electromotive Force Concordance
Counter-Electromotive Force
Section titled “Counter-Electromotive Force”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
322 hits
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9 sources
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74 sections
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Matched Aliases
Section titled “Matched Aliases”counter e.m.f., counter electromotive force, counter emf, counter-electromotive force
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theory and Calculation of Alternating Current Phenomena | 76 | 16 |
| Theory and Calculation of Alternating Current Phenomena | 72 | 15 |
| Theory and Calculation of Alternating Current Phenomena | 58 | 13 |
| Theoretical Elements of Electrical Engineering | 44 | 13 |
| Theory and Calculation of Electric Apparatus | 40 | 9 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 11 | 4 |
| General Lectures on Electrical Engineering | 10 | 2 |
| Theory and Calculation of Electric Circuits | 10 | 1 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 1 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Chapter 24: Synchronous Motor - 25 hit(s)
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... is leading, in the other lagging. Fig. 154. In Figs. 155 to 158 are shown diagrams, giving the points £"0 = impressed e.m.f., assumed as constant = 1000 volts, E = e.m.f. consumed by impedance, E^ = e.m.f. consumed by resistance (not numbered). The counter e.m.f. of the motor, Ei, is OEi, equal and parallel -£'£'0, but not shown in the diagrams, to avoid complication. The four diagrams correspond to the values of power, or motor output. P = 1,000, P = 1,000 P = 6,000 P = 9,000 P = 12,000 6,000, 9,000, 1 ...Theory Section 7: Inductance in Alternating-current Circuits - 13 hit(s)
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... the time t = -,> where tQ is time of one 1 complete period, = -v or by the time angle 6 = 90°. FIG. 11. — Self-induction effects produced by an alternating sine wave of current. This e.m.f. is called the counter e.m.f. of inductance. It is .'•'• '•••• e'*=-Ljt = - 2 TT/L/O cos 2 irft. It is shown in dotted line in Fig. 11 as e'2. The quantity 2 irfL is called the inductive reactance of the circuit, and denoted by x. It ...Chapter 4: Vector Representation - 13 hit(s)
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... hase with the current, represented by OEi in the diagram. The inductive reactance of the hne generates an e.m.f. which is pro- portional to the current, /, and the reactance, x, and lags a quarter of a period, or 90°, behind the current. To overcome this counter e.m.f. of inductive reactance, a voltage of the value Ix is required, in phase 90° ahead of the current, hence represented by vector 0E2- Thus resistance consumes voltage in phase, and reactance voltage 90° ahead of the current. The voltage of the generator, Eo ...Chapter 4: Graphic Befrisxintation - 13 hit(s)
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... equired in phase with the current, repre- sented by OE^ in the diagram. The self-inductance of the line induces an E.M.F. which is proportional to the current / and reactance -r, and lags a quarter of a period, or 90°, behind the current. To overcome this counter E.M.F. /' 24 ALTERNATING-CURRENT PHENOMENA. [§18 of self-induction, an E.M.F. of the value Ix is required, in phase 90® ahead of the current, hence represented by- vector OEj^. Thus resistance consumes E.M.F. in phase,, and reactance an E.M.F. 90° ...Chapter 4: Graphic Representation - 13 hit(s)
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... required in phase with the current, repre- sented by OEr in the diagram. The self-inductance of the line induces an E.M.F. which is proportional to the current / and reactance x, and lags a quarter of a period, or 90°, behind the current. To overcome this counter E.M.F. 24 ALTERNA TING-CURRENT PHENOMENA. of self-induction, an E.M.F. of the value Ix is required, in phase 90° ahead of the current, hence represented by vector OEX. Thus resistance consumes E.M.F. in phase, and reactance an E.M.F. 90° ahead of the cu ...Chapter 16: Induction Motor - 12 hit(s)
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... imary and secondary) passes through zero, in complex quantities, the magnetic flux is denoted by and the primary induced E.M.F., 240 ALTERNATING-CURRENT PHENOMENA. where e= V2irrt7V<I>10-8 maybe considered as the "Active E.M.F. of the motor," or " Counter E.M.F." Since the secondary frequency is s N, the secondary in- duced E.M.F. (reduced to primary system) is El = — se. Let I0 = exciting current, or current passing through the motor, per primary circuit, when doing no work (at synchronism), and K= g -j- ...Chapter 12: Effective Resistance And Reactance - 10 hit(s)
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... ce of the circuit, but the impedance, z = \/f^ + x^. 3. By the ratio: Power consumed, (Current) 2 where, however, the "power" does not include the work done by the circuit, and the counter e.m.fs. representing it, as, for instance, in the case of the counter e.m.f. of a motor. In alternating-current circuits, this value of resistance is the power coefficient of the e.m.f.. Power component of e.m.f. Total current It is called the elective resistance of the circuit, since it represents the effect, or power, expen ...Chapter 10: Effective Resistance And Reactance - 10 hit(s)
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... esistance of the circuit, but the impedance, 3.) By the ratio : r__ Power consumed . (Current)2 where, however, the "power" does not include the work done by the circuit, and the counter E.M.Fs. representing it, as, for instance, in the case of the counter E.M.F. of a motor. In alternating-current circuits, this value of resistance is the energy coefficient of the E.M.F., _ Energy component of E.M.F. Total current It is called the effective resistance of the circuit, since it represents the effect, or powe ...Chapter 21: Reaction Machines - 10 hit(s)
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... reactance. It is known that synchronous motors of large and variable reactance keep in synchronism, and are able to do a considerable amount of work, and even carry under circumstances full load, if the field-exciting circuit is broken, and thereby the counter E.M.F. E± reduced to zero, and sometimes even if the field circuit is reversed and the counter E.M.F. E± made negative. Inversely, under certain conditions of load, the current and the E.M.F. of a generator do not disappear if the gene- rator field is broken, ...Chapter 16: Reaction Machines - 10 hit(s)
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... is known that synchronous motors or converters of large and variable reactance keep in synchronism, and are able to do a considerable amount of work, and even carry under circum- stances full load, if the field-exciting circuit is broken, and thereby the counter e.m.f., E,, reduced to zero, and sometimes even if the field circuit is reversed and the counter e.m.f., £.',. made negative. Inversely, under certain conditions of load, the current and the e.m.f. of a generator do not disappear if the generator field circui ...Chapter 1: Electric Conduction. Soled And Liquid - 10 hit(s)
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... ergy, and as the rate of electrical energy supply is given by current times vol- tage, it follows that a voltage drop or potential difference occurs at the electrodes in the electrolyte. This is in opposition to the ELECTRIC CONDUCTION 7 current, or a counter e.m.f., the "counter e.m.f. of electrochem- ical polarization," and thus consumes energy, if the chemical reaction requires energy — ^as the deposition of copper from a solu- tion of a copper salt. It is in the same direction as the current, thus producing elec ...Lecture 17: Arc Lighting - 9 hit(s)
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... MINATION 243 radiation. The question whether an illuminant owes its high efficiency to selective radiation, depends largely on the defini- tion of the term "selective radiation". We have here a simi- lar case to that of the much discussed problem of the "counter electromotive force of the electric arc". Whether the electric arc has a counter e. m. f. or not, entirely depends on the defini- tion of counter e. m. f. In the same way, the decision on the question of selective radiation depends upon what you define as selective radiation ...Chapter 10: F - 9 hit(s)
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... \ 3.) By the ratio : __ Power consumed __ (E.M.F.)' . (Current)* Power consumed ' where, however, the "power*' and the "E.M.F." do not include the work done by the circuit, and the counter E.M.Fs. representing it, as, for instance, in the case of the counter E.M.F. of a motor. In alternating-current circuits, this value of resistance is the energy coefficient of the E.M.F., — Energy compon ent of E.M.F. Total current It is called the effective resistance of the circuit, since it represents the effect, or powe ...Chapter 20: Beactiox Machines - 9 hit(s)
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... reactance. It is known that synchronous motors of large and variable reactance keep in synchronism, and are able to do a considerable amount of work, and even carry under circumstances full load, if the field-exciting circuit is broken, and thereby the counter E.M.F. E^ reduced to zero, and sometimes even if the field circuit is reversed and the counter E.M.F. E^ made negative. Inversely, under certain conditions of load, the current and the E.M.F. of a generator do not disappear if the gene- rator field is broken, ...Apparatus Section 3: Induction Machines: Single -phase Induction Motor - 7 hit(s)
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... cuit of the starting device, and thus changes the distribution of currents and e.m.fs. in the starting device. The Circuits of the starting device then contain, besides the motor admittance and external admittance, an active counter e.m.f., changing with the speed. Inversely, the currents produced by the counter e.m.f. of the motor in the auxiliary circuit react upon the counter e.m.f., that is, upon the quadrature component or main flux, and change it. Th ...Chapter 14: The Alternating-Current Transformer - 6 hit(s)
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... impressed E.M.F. by combina- tion of OEr0, OEx0, and OE' by means of the parallelo- gram of E.M.Fs. is, E0 = ~OE0, and the difference of phase between the primary impressed E.M.F. and the primary current is ft0 = E0O50. In the secondary circuit : Counter E.M.F. of resistance is 1^ in opposition with Iv and represented by the vector OJS'r^ ; 198 AL TERNA TING-CURRENT PHENOMENA, 90° behind 7X, and Counter E.M.F. of reactance is represented by the vector OE^x^ Induced E.M.Fs., E( represented by the vec ...Chapter 4: Induction Motor With Secondary Excitation - 6 hit(s)
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... Total power consumed in field excitation : P = 2 t»r„ (2) where i = field exciting current. Power consumed by hysteresis: P - e*g. (3) it is then: or: 60 ELECTRICAL APPARATUS 42. Let, in a synchronous motor: E0 = impressed voltage, E = counter e.m.f., or nominal induced voltage, Z — r + jx = synchronous impedance, / = i\ — 3H = current, #o = $ + ZJ = # + (n'i + xi2) + j (xt\ - n2), (4) $ = $q — Zf = #o - (n'i + xz2) ~ j (xii - ri2), (5) or, reduced to absolute values, and choosing: g = e ...Theory Section 9: Vector Diagrams - 5 hit(s)
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... ez = x!0 cos 0, is repre- sented by a vector OEZ equal in length to x!Q, and located so that at 0 = 0, its projection on the horizontal is a maximum. That is, it is the zero vector OE2 in Fig. 18. Analogously, the counter e.m.f. of self-inductance E'2 is represented by vector OE'Z on the negative horizontal of Fig. 18; the voltage consumed by the resistance r, e\ — e!Q sin 0, is represented by vector OEi equal to r/0, and located on the nega- ...