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Related Concept Videos

Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
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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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A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
Indefinite Integrals01:25

Indefinite Integrals

The water inflow rate into a storage tank is not constant but increases over time. Initially, the pump delivers water at a rate of 5 L/min. However, the inflow rate increases by 2 L/min for each additional minute due to rising pressure or system adjustments. This scenario can be described mathematically by a linear function:It is necessary to integrate the inflow rate function to measure the total volume of water added to the tank over time. The total water volume V(t) is obtained by performing...
Charge on a Conductor01:26

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An interesting property of a conductor in static equilibrium is that extra charges on the conductor end up on its outer surface, regardless of where they originate. Consider a hollow metallic conductor with a uniform surface charge density. Since the conductor itself is in electrostatic equilibrium, there should not be any electric field inside the conductor. Now, assume a Gaussian surface enclosing the hollow portion. Applying Gauss's law, the inner surface of the hollow conductor will not...
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The Water Cycle

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Related Experiment Video

Updated: Jun 27, 2026

Hydrogen Charging of Aluminum using Friction in Water
07:50

Hydrogen Charging of Aluminum using Friction in Water

Published on: January 28, 2020

Can water store charge?

Kate Ovchinnikova1, Gerald H Pollack

  • 1Department of Bioengineering, Box 355061, University of Washington, Seattle, Washington 98195, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 5, 2008
PubMed
Summary
This summary is machine-generated.

Water can store and release significant electrical charge, as demonstrated by persistent pH gradients and recoverable current after power disconnection. This finding reveals water

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Area of Science:

  • Electrochemistry
  • Physical Chemistry
  • Water Science

Background:

  • Previous research established significant pH gradients in water via electrical current.
  • These pH gradients were observed to persist for extended periods after current cessation.

Purpose of the Study:

  • To investigate the underlying mechanism of persistent pH gradients in water.
  • To determine if these pH gradients represent a genuine charge separation and storage phenomenon.

Main Methods:

  • Establishing pH gradients by passing current between immersed electrodes.
  • Measuring electrical current flow through resistors connected to electrodes after power supply disconnection.
  • Quantifying recoverable charge imparted to the water.

Main Results:

  • Persistent pH gradients were confirmed to reflect genuine charge separation.
  • Electrical current was successfully drawn between electrodes long after the initial charging.
  • A majority of the imparted electrical charge was recoverable, indicating storage capacity.

Conclusions:

  • Water exhibits a substantial capacity for storing and releasing electrical charge.
  • The observed pH gradients are a direct consequence of this charge storage mechanism.
  • This discovery opens new avenues for understanding water's electrochemical properties.