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Related Concept Videos

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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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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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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.
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Related Experiment Video

Updated: Feb 4, 2026

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand
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Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand

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Robotic exoskeletons: The current pros and cons.

Ashraf S Gorgey1

  • 1Spinal Cord Injury and Disorders Center, Hunter Holmes McGuire VAMC, Richmond, VA 23249, United States.

World Journal of Orthopedics
|September 27, 2018
PubMed
Summary
This summary is machine-generated.

Robotic exoskeletons show promise for spinal cord injury (SCI) rehabilitation, but high costs and limited evidence hinder widespread clinical use. Further research and integration with other technologies are needed to realize their full potential.

Keywords:
ExoskeletonLocomotionRehabilitationRoboticsSpinal cord injury

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Area of Science:

  • Rehabilitation Medicine
  • Neuroscience
  • Biomedical Engineering

Background:

  • Robotic exoskeletons offer potential benefits for individuals with spinal cord injury (SCI).
  • Current clinical application is limited by high costs and insufficient evidence.
  • Existing health consequences after SCI include issues with weight, physical activity, and bone health.

Purpose of the Study:

  • To review the limitations and potential benefits of robotic exoskeletons in SCI rehabilitation.
  • To identify key design and health-related factors for exoskeleton application in SCI.

Main Methods:

  • Mini-review of existing literature on robotic exoskeletons for SCI rehabilitation.
  • Analysis of design aspects (safety, fitting time, speed) and health outcomes (body weight, physical activity, pressure injuries, bone health).

Main Results:

  • Key design considerations include safety, fitting time, and speed.
  • Health-related factors encompass body weight management, physical activity levels, pressure injury prevention, and bone health maintenance.
  • Clinical trials are ongoing to address limitations and enhance benefits.

Conclusions:

  • Robotic exoskeletons have the potential to transform SCI rehabilitation.
  • Integration with technologies like functional electrical stimulation and brain-computer interfaces is a promising future direction.
  • It is currently premature to establish definitive clinical recommendations for exoskeleton use in SCI.