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Related Concept Videos

Ammeter01:11

Ammeter

2.9K
An ammeter is a current measuring instrument. In the circuit, it is represented by the symbol A. The ammeter is placed in series with the device or component to measure the current. A series connection is used because objects in series have the same current passing through them. If a circuit has multiple resistors and the current needs to be measured in each resistor, the number of ammeters required depends on whether the circuit is in series or parallel.
When an ammeter is used to measure the...
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Galvanometer01:24

Galvanometer

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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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Charge and Current01:14

Charge and Current

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Electric charge is the most fundamental quantity in an electric circuit. The effects of electric charge are encountered daily, such as when a wool sweater sticks to the human body or when a person receives a shock while walking on a carpet.
Charge is an inherent property of the atomic particles that make up matter and is measured in units called coulombs (C). Matter is composed of atoms, each consisting of electrons, protons, and neutrons. Electrons have a negative charge (-e), while protons...
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Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the...
1.4K
Voltmeter01:18

Voltmeter

3.2K
A voltmeter is an electrical device that measures the potential difference or voltage between two points. It is connected in parallel with the circuit element it is measuring. A parallel connection is used because elements in parallel experience the same potential difference. The voltmeter is represented by the symbol "V ".
An ideal voltmeter would have infinite resistance, so connecting it between two points in a circuit would not alter any of the currents. Real voltmeters always have...
3.2K
Potentiometer01:30

Potentiometer

2.8K
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces
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A charge parity ammeter.

Nicholas J Lambert1, Megan Edwards, Chiara Ciccarelli

  • 1Cavendish Laboratory , J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Nano Letters
|February 12, 2014
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel single electron ammeter. It precisely counts electrons in a metallic double dot by analyzing electrical impedance changes from electron tunneling.

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Area of Science:

  • Quantum electronics
  • Mesoscopic physics
  • Nanotechnology

Background:

  • Metallic double dots are key components in quantum computing and electronics.
  • Accurate electron counting is crucial for understanding quantum phenomena and developing quantum devices.

Purpose of the Study:

  • To develop a method for precise electron counting in a metallic double dot.
  • To demonstrate the functionality of a single electron ammeter without external charge detection.

Main Methods:

  • Utilizing radio frequency reflectometry to measure the metallic double dot.
  • Analyzing single electron tunneling contributions to complex electrical impedance.
  • Performing electron counting experiments by monitoring impedance changes.

Main Results:

  • Successfully determined changes in the total electron number of the double dot.
  • Demonstrated the operation of a single electron ammeter.
  • Achieved electron counting without relying on external charge detection methods.

Conclusions:

  • Radio frequency reflectometry and electrical impedance analysis provide a viable method for electron counting.
  • The developed technique enables single electron ammeter functionality.
  • This approach offers a promising pathway for advanced quantum electronic measurements.