Alan V. Oppenheim Created 2026-10-14 Updated 2026-10-24
He authored lecture notes and transparencies. [ref]
Figure 1.
Professor Alan Oppenheim
. Portrait by SJMW1987, licensed CC BY-SA 4.0. Source.
Anant Agarwal 2026-11-05
Anant Agarwal is a computer scientist and electrical engineer whose work includes computer architecture, multicore processors and circuit education. MIT's departmental profile lists computer architecture among his research areas, while his CSAIL profile describes work involving multicore computing and authorship of a circuits textbook.[ref]
The MIT lecture State and Memory by Anant Agarwal and Jeffrey Lang, jointly credited with Jeffrey Lang, connects analog stored state to computer memory. A capacitor can summarize prior input by one state quantity, such as stored electric charge ; digital storage then adds a rule for distinguishing logical values. The slides explicitly introduce capacitor state, zero-input response, zero-state response and a one-bit memory abstraction.[ref]
For an original physical-memory example, let a capacitor initially hold and leak through a resistor. With no driving input,
If a stipulated readout interprets values above as the stored high state, the ideal decay reaches that threshold after
The initial stored electric charge is , but the logical interpretation also depends on leakage, the elapsed time and the decision threshold. This is a teaching model, not a specification for a particular memory chip.
The example exposes why merely retaining some electric charge is different from reliably retaining a bit. A practical memory circuit must preserve distinguishable states over the required interval and allow the state to be read. Agarwal and Lang's lecture uses the state concept to connect the circuit's dynamics with that information-storage task.
Bill Pickering (rocket scientist) Created 2026-10-24 Updated 2026-11-05
Bill Pickering (rocket scientist) was an electrical engineer whose work connected electronic instrumentation with robotic space exploration. His experience designing telemetry equipment brought him to the Jet Propulsion Laboratory, where he later served as director from 1954 to 1976.[ref]
During that period, JPL participated in the launch of Explorer 1 and developed spacecraft for studying the Moon and planets. The Ranger program returned close-up lunar images and the Surveyor program achieved soft landings. Those missions illustrate the coupled engineering problem: an instrument must make a useful measurement, and the spacecraft must control its operation and communicate the result across a large distance.[ref]
Changhuei Yang 2026-10-18
Figure 1.
Portrait of Changhuei Yang
. Institutional portrait identified on the Caltech electrical engineering profile.
Charles K. Kao Created 2026-10-24 Updated 2026-11-05
Charles K. Kao was an electrical engineer whose work helped establish the feasibility of low-loss optical fiber communication. With George Alfred Hockham, he analyzed dielectric-fibre guidance at optical frequencies, including the losses and information-carrying limitations of the medium.[ref]
The important engineering question was how to turn a physically guided mode into a practical long-distance signal path. Their analysis examined absorption, bending loss and dispersion alongside mode behaviour. This linked the electromagnetic design of a waveguide to the properties of the glass and to the timing of signals, rather than treating transparency as a sufficient description.[ref]
Colin Cherry Created 2026-10-24 Updated 2026-10-31
An electrical engineer whose experiments investigated selection and recognition of simultaneous speech.
Figure 1.
Portrait of Colin Cherry
. Historical photograph hosted by the MacTutor History of Mathematics archive at the University of St Andrews. Source.
Daniel J. Carnovale 2026-11-05
Daniel J. Carnovale is an electrical engineer associated with investigating and demonstrating the behavior of electric power systems. His coauthored Capacitor Application Issues by Thomas M. Blooming and Daniel J. Carnovale identifies his Eaton affiliation; its author biography describes a demonstration and test facility for reproducing electrical supply problems and evaluating their mitigation.[ref]
One important distinction in power factor correction is between reduced source electric current and reduced useful-load active power. For an original idealized example, a load takes and at RMS. Before correction,
Canceling the fundamental reactive power makes source electric current , but leaves the stipulated load's unchanged. With a fixed upstream electrical resistance of , conductor Joule heating falls from to . The reduction is , rather than 20% of the load's active demand.
A proposed demonstration measures load active power, source RMS electric current and upstream conductor loss separately while connecting the correction branch. It makes the changed and unchanged quantities visible. The same input-output discipline applies when comparing a device's apparent electrical savings with useful service delivered. The numerical example above is an original fixed-boundary calculation, not a measurement attributed to Carnovale.
His paper with Thomas M. Blooming places such calculations within practical capacitor application. Choosing a nominal correction alone does not describe how variable load and the existing network affect operation. The distinction motivates recording terminal waveforms and operating conditions along with a single power factor number.
Electrical engineer Created 2026-10-14 Updated 2026-11-05
An electrical engineer designs or analyzes systems involving electrical energy, electromagnetic fields and information-carrying signals. The work includes circuits, power conversion, communication, instrumentation and control. A sensor readout, for example, needs an amplifier that preserves the signal while accounting for noise, bandwidth, loading and supply limitations. The mathematical circuit model must be compared with component tolerances and measured behaviour, because an ideal amplifier equation does not capture every physical limit.
Emmett Leith Created 2026-10-18 Updated 2026-11-05
Emmett Leith was an electrical engineer whose work with Juris Upatnieks developed wavefront reconstruction through a communication-theory treatment of holography. Their 1962 paper analyzed recording and reconstruction as a sequence of modulation, propagation and intensity detection, and tested methods for improving the reconstructed signal.[ref]
The connection is useful because an intensity recording can contain information about an optical wave's phase through interference with a reference wave. Changing the recording geometry can separate the desired reconstruction from unwanted terms. Their work helped make clear three-dimensional holographic images practical while linking optical processing with spatial frequency analysis.[ref]
George Alfred Hockham Created 2026-10-18 Updated 2026-11-05
George Alfred Hockham was an electrical engineer whose work with Charles K. Kao examined optical fibers as communication waveguides. Their 1966 paper analyzed how a dielectric core with a higher refractive index than its surroundings can guide an electromagnetic wave.[ref]
The work treated guidance together with practical losses, bending and dispersion. A guided field alone does not specify a useful communication link: the signal must survive propagation, and different components must remain distinguishable at the receiver. Their combination of optical and microwave investigations connected the field calculation with the engineering feasibility of the transmission medium.[ref]
Harry Nyquist Created 2026-10-18 Updated 2026-11-05
Harry Nyquist was an electrical engineer whose work connected communication engineering with physical and mathematical limits. His 1928 theory explained thermal electrical fluctuations using thermodynamics and statistical mechanics, agreeing with John Bertrand Johnson's measurements.[ref]
In the classical regime , an approximately constant electrical resistance at temperature produces an open-circuit voltage expected value square over a one-sided frequency band of width . Here is the Boltzmann constant. The formula connects Johnson-Nyquist noise with both the physical conductor and the signal bandwidth through which it is observed.[ref]
Hermann Anton Haus Created 2026-10-18 Updated 2026-11-05
Hermann Anton Haus was an electrical engineer whose research ranged from quantum optics to optical communication systems and ultrashort laser pulses. His work on optical solitons helped connect nonlinear wave propagation with the transmission of information through optical fibers.[ref]
With James R. Melcher, he wrote Electromagnetic Fields and Energy by Hermann A. Haus and James R. Melcher, a text that links field equations with concrete devices and demonstrations. Its magnetic circuit analysis, for example, shows how geometry and constitutive assumptions turn an electromagnetic field problem into an approximate engineering model.[ref]
Hiroshi Amano Created 2026-10-18 Updated 2026-11-05
Hiroshi Amano is an electrical engineer whose work with Isamu Akasaki helped overcome two obstacles to blue light-emitting diodes: growing high-quality gallium nitride and obtaining controllable p-type semiconductor.[ref]
A low-temperature-deposited aluminium nitride buffer layer improved subsequent gallium nitride growth on sapphire. His lecture compares the resulting surfaces using scanning electron microscopy. The research also showed that low-energy electron irradiation of magnesium-doped gallium nitride could activate p-type semiconductor, enabling a p-n junction. The two results address different requirements: structural quality and the electrical activity of the semiconductor doping.[ref]
Figure 1.
Portrait of Hiroshi Amano
. 研究振興局振興企画課; attribution: 文部科学省ホームページ. CC BY 4.0, via Wikimedia Commons. Source.
Isamu Akasaki Created 2026-10-18 Updated 2026-11-05
Isamu Akasaki was an electrical engineer whose research helped establish gallium nitride as a material for blue and ultraviolet light-emitting diodes. Working with Hiroshi Amano and other collaborators, he pursued improvements in crystal quality and in the control of p-type and n-type semiconductor.[ref]
The scientific motivation follows from photon energy: shorter visible wavelengths require larger transition energies. A sufficiently wide band gap is therefore necessary for blue emission, but it does not by itself produce a useful device. The material must also support carrier injection and efficient light emission. High-quality growth and an operating p-n junction turned those physical requirements into an engineering platform for full-colour displays and lighting.[ref]
Figure 1.
Portrait of Isamu Akasaki
. 大臣官房人事課; attribution: 文部科学省ホームページ. CC BY 4.0, via Wikimedia Commons. Source.
James L. Kirtley Jr. 2026-11-05
James L. Kirtley Jr. is an electrical engineer whose work concerns electric machines and electric power systems. MIT's departmental profile identifies him as a professor emeritus of electrical engineering, with energy and robotics among his research areas.[ref]
Figure 1.
James L. Kirtley Jr., portrait in MIT Energy Initiative's 2016 interview
. Identified James Kirtley photograph linked from the institutional interview; served directly by MIT.
The engineering problem is to match a motor's behaviour to its application. MIT reported in 2016 that Kirtley worked on customized electric motors for the MIT Cheetah robot, where brief peaks of torque serve running and jumping. The same interview describes his interest in electric motors interacting with microgrids, particularly their dynamic behaviour during supply disturbances.[ref] A short burst and sustained operation place different demands on the system; the largest instantaneous output alone does not describe its operating role.
His AC Power Flow in Linear Networks by James L. Kirtley Jr. connects the phasor representation of electric potential difference and electric current to physical energy transfer. In its peak-amplitude convention, complex electrical power is . With RMS phasors and , this becomes . The complex conjugate ensures that the relative phase enters the active power.[ref]
For an original load example in sinusoidal steady state, take and electrical impedance , using RMS phasors and the passive sign convention: electric current enters the positive-potential terminal. A series resistor and inductor realize this model at the specified angular frequency when and . Then
Thus active power is 48 watts, reactive power is 64 vars, apparent power is 80 volt-amperes, and power factor is . Write and . The corresponding electric potential difference and electric current are
Multiplying and applying a trigonometric identity gives instantaneous power
Its cycle average is 48 watts, while its range is watts. The negative portions represent temporary return of stored energy from this ideal load; the electrical resistance still dissipates a positive average. A synchronized product of the two waveforms reveals this behaviour, whereas multiplying their root mean square magnitudes gives only the apparent power.
Figure 2.
A phase-shifted load returns energy during part of each cycle while absorbing positive average power
. Original 20 volt RMS example with impedance ohms. The voltage and current have power factor 0.6; their instantaneous product ranges from -32 to 128 watts and averages 48 watts. Values are illustrative rather than measured motor data. Details.
James R. Melcher Created 2026-10-18 Updated 2026-11-05
James R. Melcher was an electrical engineer whose work helped define continuum electromechanics: the interaction of electromagnetic fields with deformable materials and flowing fluids. His applications included energy conversion, flow measurement and the control of industrial processes.[ref]
With Hermann Anton Haus, he wrote Electromagnetic Fields and Energy by Hermann A. Haus and James R. Melcher. A central engineering theme is the relation between a full field description and a justified approximation. In a magnetic circuit, for example, geometry and permeability assumptions determine when a small set of circuit-like variables can represent the spatial fields.[ref]
Jeffrey Lang 2026-11-05
Jeffrey Lang is an electrical engineer whose work concerns electromechanical conversion power balance, control and small-scale devices. MIT's Research Laboratory of Electronics identifies the same professor as Jeffrey H. Lang and describes research on electric motors, electrical generators and microelectromechanical systems, together with teaching in circuits and electromagnetism.[ref]
The identified MIT profile provides an externally hosted portrait of Jeffrey H. Lang.
For an original motor-scale illustration, a shaft delivering torque at angular velocity delivers . If electrical input is and the operating point is steady, the remaining must be accounted for by losses or another specified output. During acceleration some input can instead increase rotational kinetic energy. Reporting only shaft speed would not establish either output power or conversion efficiency.
With Anant Agarwal, Lang is credited on the MIT course material State and Memory by Anant Agarwal and Jeffrey Lang. It explains how a capacitor's state summarizes the part of past input needed to predict its future response.[ref] For a series RC circuit with a constant later input ,
Two different earlier input histories that leave the same initial capacitor electric potential difference give the same subsequent response under the same future input. For stipulated , and , the value after one time constant is . This original numerical example shows what it means for the state to retain enough of the past without retaining the entire waveform.