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Related Concept Videos

Electric Generator: Alternator01:25

Electric Generator: Alternator

Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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...
DC Generator01:19

DC Generator

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...
Back EMF01:24

Back EMF

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 induced.
Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Charging Conductors By Induction01:15

Charging Conductors By Induction

The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...

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Related Experiment Video

Updated: May 19, 2026

Home-Based Monitor for Gait and Activity Analysis
07:24

Home-Based Monitor for Gait and Activity Analysis

Published on: August 8, 2019

Generating Electricity While Walking with Smart Magnetoelastic Insoles.

Xiujun Fan1, Sophia Shen1, Kamryn Scott1

  • 1Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States.

ACS Nano
|May 18, 2026
PubMed
Summary

This study presents a waterproof magnetoelastic smart insole that generates electricity from walking. This wearable energy harvesting technology offers a sustainable power source for devices like running lights and thermoregulation systems.

Keywords:
active thermoregulationenergy harvestingmagnetoelastic generatorsmart insolesoft bioelectronics

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Wearable Technology

Background:

  • Human walking generates significant kinetic energy, but its conversion to electricity is hindered by shoe humidity.
  • Existing energy harvesting methods face challenges with efficiency and durability in real-world conditions.

Purpose of the Study:

  • To develop a waterproof and biocompatible magnetoelastic smart insole for efficient energy generation during walking.
  • To explore the potential of this smart insole for powering wearable devices and enabling personalized thermoregulation.

Main Methods:

  • Utilized the giant magnetoelastic effect to engineer a waterproof magnetoelastic smart insole.
  • Integrated ultralow internal impedance (∼80 Ω) for enhanced electrical output.
  • Tested the insole's performance, durability, and power generation capabilities.

Main Results:

  • Achieved substantial current output up to 59.9 mA and peak power of 1.04 mW.
  • Demonstrated the insole's capability to power running lights and support personalized thermoregulation.
  • Confirmed exceptional durability with consistent peak performance after prolonged use and water immersion.

Conclusions:

  • The magnetoelastic smart insole offers a sustainable, efficient, and robust power source for the Internet of Things (IoT).
  • This technology provides a decentralized, mobile energy solution, overcoming limitations of traditional power grids.
  • The waterproof design addresses a key challenge in wearable energy harvesting, paving the way for practical applications.