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Related Concept Videos

Van de Graaff Generator01:15

Van de Graaff Generator

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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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DC Generator01:19

DC Generator

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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Back EMF01:24

Back EMF

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Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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Self-Powered Active Sensing Based on Triboelectric Generators.

Gaurav Khandelwal1, Ravinder Dahiya1

  • 1Bendable Electronics and Sensing Technologies (BEST) Group, James Watt South Building, School of Engineering, University of Glasgow, Glasgow, G12 8QQ, UK.

Advanced Materials (Deerfield Beach, Fla.)
|April 21, 2022
PubMed
Summary
This summary is machine-generated.

Triboelectric nanogenerators (TENGs) can act as both sensors and energy harvesters for portable devices. This review explores TENGs for self-powered chemical and biological sensors, highlighting their potential and challenges.

Keywords:
biosensorschemical sensorsflexible electronicsself-powered sensorstriboelectric nanogenerators

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Growing demand for portable and wearable sensors necessitates sustainable power solutions.
  • Mechanical energy harvesters, like piezoelectric and triboelectric generators (TEGs), offer a promising alternative for powering sensors.
  • TEGs can function as both energy harvesters and active sensors, reducing system complexity.

Purpose of the Study:

  • To review the development and application of TEGs as self-powered active chemical and biological sensors.
  • To explore the potential of multifunctional TEGs in reducing device count and integration challenges.
  • To discuss the influence of material choice, design, and environmental factors on TEG-based sensing.

Main Methods:

  • Review of existing literature on TEGs used in chemical and biological sensing.
  • Analysis of TEG principles for energy harvesting and analyte-modulated electrical output.
  • Discussion of TEG-based physical, magnetic, and optical sensors.

Main Results:

  • TEGs show significant promise for energy-autonomous chemical and biological sensors due to material versatility and analyte-tunable energy conversion.
  • Multifunctional TEGs can reduce the number of devices required in a system.
  • TEG design and environmental factors critically influence sensing performance.

Conclusions:

  • TEGs are a viable technology for developing self-powered active sensors, particularly in chemical and biological detection.
  • Further research into TEG design, materials, and environmental robustness is needed to overcome current challenges.
  • The integration of TEGs holds significant potential for advancing the field of self-powered sensor systems.