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Maximum Power Transfer01:16

Maximum Power Transfer

843
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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Communication01:03

Communication

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Communication01:28

Communication

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Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
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Power Distribution in Three-phase and Single Phase Circuits01:17

Power Distribution in Three-phase and Single Phase Circuits

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Power distribution within electrical circuits is a foundational aspect of residential and industrial energy systems. While single-phase power is common in residential settings, three-phase power is the standard for industrial environments with heavy machinery. Each system is different and has advantages, and it's crucial to understand the underlying principles of power distribution and material efficiency.
Single-Phase Power Distribution:
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Related Experiment Video

Updated: Jan 21, 2026

Data Communication Based on MQTT in a Polymer Extrusion Process
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Autonomous RFID Sensor Node Using a Single ISM Band for Both Wireless Power Transfer and Data Communication.

Abderrahim Okba1, Dominique Henry2, Alexandru Takacs2

  • 1LAAS-CNRS, Université de Toulouse, CNRS, INSA, UPS, 31400 Toulouse, France. abderrahim.okba@laas.fr.

Sensors (Basel, Switzerland)
|August 1, 2019
PubMed
Summary

This study presents autonomous radio-frequency identification (RFID) sensor nodes powered wirelessly. These nodes achieved 10 minutes of continuous data communication using a shared frequency band for power and data transmission.

Keywords:
RFID sensor tagautonomous wireless sensor nodesrectennawireless power transfer

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Area of Science:

  • Electrical Engineering
  • Wireless Communication
  • Sensor Technology

Background:

  • Autonomous sensor nodes require efficient power solutions.
  • Wireless power transfer (WPT) offers a promising alternative to traditional batteries.
  • Integrating power and data transmission in a single frequency band is challenging for size reduction.

Purpose of the Study:

  • To implement autonomous radio-frequency identification (RFID) sensor nodes using wireless power transfer.
  • To propose a switching method for utilizing a single frequency band for both power supply and data transmission.
  • To demonstrate the feasibility of size-reduced, self-powered RFID sensor nodes.

Main Methods:

  • A switching method was developed to share a frequency band for power and data.
  • A rectenna was employed to harvest radiofrequency energy for supercapacitor charging.
  • The system was tested using a 7 mF supercapacitor and an 868 MHz frequency band.

Main Results:

  • Autonomous sensor nodes successfully communicated wirelessly for 10 minutes continuously.
  • Communication was maintained at a 1-meter tag-to-reader separation distance.
  • Effective radiated powers of 2 W (charging) and 100 mW (communication) were utilized.

Conclusions:

  • The proposed method enables the implementation of autonomous RFID sensor nodes with size reduction.
  • Shared frequency band operation for WPT and data transmission is feasible.
  • The system demonstrates a practical solution for self-powered wireless sensing applications.