Lecture 4: Single-Energy Transients In Alternating Current Circuits

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Source Metadata

Field	Value
Source	Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients
Year	1911
Section ID	`elementary-lectures-electric-discharges-waves-impulses-lecture-04`
Location	lines 2162-2971
Status	candidate
Word Count	5396
Equation Candidates In Section	62
Figure Candidates In Section	1
Quote Candidates In Section	0

Opening Source Excerpt

LECTURE IV. SINGLE-ENERGY TRANSIENTS IN ALTERNATING- CURRENT CIRCUITS. 17. Whenever the conditions of an electric circuit are changed in such a manner as to require a change of stored energy, a transi- tion period appears, during which the stored energy adjusts itself from the condition existing before the change to the condition after the change. The currents in the circuit during the transition period can be considered as consisting of the superposition of the permanent current, corresponding to the conditions after the change, and a transient current, which connects the current value before the change with that brought about by the change. That is, if i\ = current existing in the circuit immediately before, and thus at the moment of the change of circuit condition, and i% = current which should exist at the moment

Source-Located Theme Snippets

Field language

... aneous values of the resultant currents (shown in drawn line) must be zero at any moment, not only during the permanent condition, but also dur- ing the transition period existing before the permanent condi- tion is reached. It is interesting to apply this to the resultant magnetic field produced by three equal three-phase magnetizing coils placed under equal angles, that is, to the starting of the three-phase rotating magnetic field, or in general any polyphase rotating magnetic field. Fig. 18. — Construction of Starting Transient of Rotating Field. As ...

Transients / damping

LECTURE IV. SINGLE-ENERGY TRANSIENTS IN ALTERNATING- CURRENT CIRCUITS. 17. Whenever the conditions of an electric circuit are changed in such a manner as to require a change of stored energy, a transi- tion period appears, during which the stored energy adjusts itself from the condition existing before the c ...

Magnetism

... ore gradually decreases in the manner as discussed in para- graph 13, that is, with a duration T = — - The permanent current i2 may be continuous, or alternating, or may be a changing current, as a transient of long duration, etc. The same reasoning applies to the voltage, magnetic flux, etc. Thus, let, in an alternating-current circuit traversed by current t'i, in Fig. 15 A, the conditions be changed, at the moment t = 0, so as to produce the current i2. The instantaneous value of the current ii at the moment t = 0 can be considered as consisting of ...

Waves / transmission lines

... n Fig. 15B, and is a maximum, if the change occurs at the moment when the two currents i\ and iz have the greatest difference, that is, at a point one-quarter period or 90 degrees distant from the intersection of i\ and 12, as shown in Fig. 15C. 32 ELECTRIC DISCHARGES, WAVES AND IMPULSES. If the current ii is zero, we get the starting of the alternating current in an inductive circuit, as shown in Figs. 16, A, B, C. The starting transient is zero, if the circuit is closed at the moment when the permanent current would be zero (Fig. 16B), and ...

Chapter-Local Concept Hits

Concept Candidate	Hits In Section	Status
Frequency	31	seeded
Ether	2	seeded
Light	2	seeded

Chapter-Local Glossary Hits

Term Candidate	Hits In Section	Status
ether	2	seeded

Equation Candidates

Candidate ID	OCR / PDF-Text Candidate	Source Location
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0076`	graph 13, that is, with a duration T = — -	line 2186
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0077`	t’i, in Fig. 15 A, the conditions be changed, at the moment t = 0,	line 2194
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0078`	so as to produce the current i2. The instantaneous value of the	line 2195
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0079`	current ii at the moment t = 0 can be considered as consisting	line 2196
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0080`	of the instantaneous value of the permanent current i2, shown	line 2197
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0081`	Fig. 15. — Single-energy Transient of Alternating-current Circuit.	line 2220
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0082`	or 90 degrees distant from the intersection of i\ and 12, as shown	line 2229
`elementary-lectures-electric-discharges-waves-impulses-eq-candidate-0083`	Fig. 16. — Single-energy Starting Transient of Alternating-current Circuit.	line 2252

Figure Candidates

Candidate ID	OCR / PDF-Text Candidate	Source Location
`elementary-lectures-electric-discharges-waves-impulses-fig-025`	frequency, and as the result an increase of voltage and a distor- tion of the quadrature phase occurs, as shown in the oscillogram Fig. 25. Various momentary short-circuit pheno…	line 2904

Hidden-Gem Quote Candidates

Candidate ID	Candidate Passage	Source Location
No chapter-local candidates yet	-	-

Modern Engineering Reading Prompts

Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
Transients / damping: Separate the temporary term from the final steady-state term and compare with differential-equation response language.
Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.

Ether-Field Interpretive Boundary

Field language: Field-pressure or field-gradient interpretations can be explored here only after the explicit source passage and modern engineering translation are kept distinct.
Transients / damping: Transient collapse, impulse, and surge behavior can be compared with alternative field language, but only as a clearly marked reading.
Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.

Promotion Checklist

Open the full source text and the scan or raw PDF.
Verify the chapter boundary and surrounding context.
Promote exact quotations only after checking the source image.
Move mathematical candidates into canonical equation pages only after formula typography is corrected.
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