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Related Concept Videos

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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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Amperometry: Overview01:10

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Ohm's Law01:21

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Many materials exhibit a simple relationship between the values of current, voltage, and resistance, known as Ohm’s law. The current that flows through most substances is directly proportional to the voltage applied to them. The German physicist Georg Simon Ohm (1787–1854) was the first to demonstrate experimentally that the current in a metal wire is directly proportional to the voltage applied. Any material, component, or device that obeys Ohm’s law, where the current...
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Ammeter01:11

Ammeter

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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.
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Potentiometer01:30

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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.
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Related Experiment Video

Updated: Aug 15, 2025

Author Spotlight: Advances in Evaluating Human Lung Epithelial Cells' Response to Metal-Organic Frameworks
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Passive Fingerprinting of Same-Model Electrical Devices by Current Consumption.

Mikhail Ronkin1, Dima Bykhovsky2

  • 1Engineering School of Information Technologies, Telecommunications and Control Systems, Ural Federal University, 620078 Yekaterinburg, Russia.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary

This study introduces a novel device authentication method using electrical current consumption as a unique fingerprint. This technique achieved 94% precision in identifying similar electrical devices, offering a promising security solution.

Keywords:
consumption analysiscurrent measurementdevice fingerprintingelectrical deviceelectrical networkswitched-mode power supply (SMPS)time-series classification (TSC)

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Cybersecurity

Background:

  • Device authentication is crucial for security.
  • Existing methods rely on software or hardware characteristics.
  • A passive, externally measurable fingerprinting technique is needed.

Purpose of the Study:

  • To propose a novel device fingerprinting technique using electrical current consumption.
  • To assess the feasibility of identifying same-model devices based on minute current variations.
  • To evaluate the performance of various time-series classification methods for this task.

Main Methods:

  • Collected current consumption signals from 40 same-model computer displays.
  • Utilized state-of-the-art time-series classification (TSC) methods.
  • Compared performance of different TSC techniques, including Empirical Wavelet Transform (EWT) and Linear Discriminant Analysis (LDA).

Main Results:

  • Successfully identified 40 similar electrical devices with approximately 94% precision.
  • Most classification errors occurred between a small subset of devices.
  • A simplified Empirical Wavelet Transform (EWT) combined with Linear Discriminant Analysis (LDA) was identified as the optimal classification method.

Conclusions:

  • Electrical current consumption can serve as a reliable device fingerprint for authentication.
  • The proposed EWT-LDA method demonstrates high accuracy in distinguishing between similar devices.
  • This passive, externally measured approach offers a practical solution for device identification and security.