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Related Concept Videos

Galvanometer01:24

Galvanometer

3.2K
Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
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Mesh Analysis with Current Sources01:10

Mesh Analysis with Current Sources

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Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
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Electrical Current01:10

Electrical Current

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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Mesh Analysis01:20

Mesh Analysis

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Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
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Measurement of Bioelectric Current with a Vibrating Probe
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Using Geometry To Sense Current.

Adam N McCaughan1, Nathnael S Abebe1, Qing-Yuan Zhao1

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Nano Letters
|December 15, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel superconducting device that senses current flow using geometric current crowding. This Y-shaped device modulates a bias current

Keywords:
current crowdingelectronicsfluxonmemorynondestructive readoutsuperconductivityyTron

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Area of Science:

  • Superconducting electronics
  • Nanoscale device physics
  • Quantum sensing

Background:

  • Current crowding is a geometric effect in conductors.
  • Superconducting critical current is sensitive to local conditions.

Purpose of the Study:

  • To demonstrate a three-terminal superconducting device for current sensing.
  • To utilize current crowding for non-invasive current measurement.

Main Methods:

  • Fabrication of a Y-shaped superconducting device.
  • Applying sense and bias currents to device arms.
  • Measuring modulation of bias critical current by sense current.

Main Results:

  • Successfully demonstrated current sensing via critical current modulation.
  • Achieved non-invasive measurement of trapped quantized currents.
  • Current crowding effect enables local interaction between sense and bias currents.

Conclusions:

  • The Y-shaped device offers a new method for superconducting current sensing.
  • Current crowding provides a universal mechanism for device operation.
  • Potential applications in superconducting technologies and nonlinear systems.