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Related Concept Videos

The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the power flow program computes the...
Control of Power Flow01:30

Control of Power Flow

There are several methods to control power flow in power systems:
Nodal Analysis with Voltage Sources01:11

Nodal Analysis with Voltage Sources

Nodal analysis is a remarkably effective method used in electrical engineering to simplify the analysis of complex circuits, including those with dependent or independent voltage sources. Its strength lies in its systematic approach to breaking down circuits into manageable components, making it easier for engineers to understand and solve.
Consider a circuit that contains four resistors and two voltage sources, as shown in Figure 1. One of these voltage sources is connected between a...
The Power Superposition Principle01:19

The Power Superposition Principle

Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...

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Related Experiment Video

Updated: Jul 2, 2026

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Anomalous power flow and "ghost" sources.

Cesar Monzon1

  • 1Enig Associates, Inc., Silver Spring, Maryland 20904, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Complex electromagnetic radiation sources can create "ghost" sources by directing power back to themselves. This phenomenon, achieved with ordinary waves, has potential applications in deception and other fields.

Related Experiment Videos

Last Updated: Jul 2, 2026

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Area of Science:

  • Electromagnetism
  • Wave physics

Background:

  • Complex electromagnetic (EM) sources can exhibit unusual radiation behavior.
  • Understanding wave propagation and energy flow is crucial in physics.

Purpose of the Study:

  • To demonstrate a mechanism where EM radiation from complex sources directs power back towards the source.
  • To explore the potential applications and controllability of this phenomenon.

Main Methods:

  • Analysis of electromagnetic radiation from complex sources.
  • Theoretical modeling of wave propagation and power flow.
  • Conceptualization of methods for harnessing the effect.

Main Results:

  • Demonstrated that real power can flow backward towards complex EM sources in specific regions.
  • Identified this effect as mimicking "ghost" sources without relying on backward waves.
  • Presented methods for directional control and potential applications.

Conclusions:

  • The counterintuitive backward power flow is achievable with ordinary waves.
  • The phenomenon offers novel applications, including deception, and is feasible with current technology.
  • The underlying principles may extend to other wave-based systems like acoustics and mechanics.