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Resistance

Resistance

When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...

Ohm's Law

Ohm's Law

Resistors are fundamental components in electrical circuits, often manufactured from metallic alloys or carbon compounds. They model a material's ability to resist the flow of electric current, a characteristic that is crucial in controlling and regulating electrical power within a circuit.
This current-resisting behavior of resistors is governed by Ohm's law, which states that the voltage across a resistor is directly proportional to the current flowing through it.

Ohm's Law

Ohm's Law

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...

Resistivity

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:

Power and Energy

Power and Energy

The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as

Resistance and Conductance

Resistance and Conductance

A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...

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Related Experiment Video

Updated: Jan 15, 2026

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Published on: September 26, 2017

The energy resistance principle.

Martin Picard¹, Nirosha J Murugan²

¹Department of Psychiatry, Division of Behavioral Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Neurology, H. Houston Merritt Center for Neurological and Mitochondrial Disorders, Columbia University Irving Medical Center, New York, NY 10032, USA; New York State Psychiatric Institute, New York, NY 10032, USA; Robert N. Butler Columbia Aging Center, Mailman School of Public Health, New York, NY 10032, USA.

Cell Metabolism

|October 7, 2025

Summary

This summary is machine-generated.

The energy resistance principle (ERP) explains how biological energy transformation works. Excess energy resistance (éR) causes disease and aging, while managing it promotes health.

Keywords:

GDF15 biological circuits biomarkers cytokines disease energy exercise healing inflammation mitochondria oxygen physical laws transformation

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Last Updated: Jan 15, 2026

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Published on: September 26, 2017

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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation

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Published on: October 10, 2018

Area of Science:

Bioenergetics
Systems Biology
Metabolic Regulation

Background:

Living organisms function as physical-energetic systems governed by energy transformation principles.
The energy resistance principle (ERP) defines energy behavior within biological systems.
Energy resistance (éR) is crucial for converting food energy into biological work.

Purpose of the Study:

To introduce and explain the energy resistance principle (ERP).
To elucidate the role of energy resistance (éR) in biological energy transformation.
To establish ERP as a framework for understanding health, disease, and aging.

Main Methods:

Conceptual framework development based on bioenergetic principles.
Analysis of energy flow and transformation in biological systems.
Correlation of energy resistance (éR) with physiological states and biomarkers.

Main Results:

Energy resistance (éR) is fundamental for energy transformation, converting potential energy into work.
Elevated éR is linked to disease and aging hallmarks like stress, inflammation, and molecular damage.
Specific stressors increase éR and GDF15 levels, while restorative activities decrease éR.

Conclusions:

The energy resistance principle (ERP) provides a unified view of bioenergetic forces in life.
Managing energy resistance (éR) is key to understanding and intervening in the health-disease continuum.
ERP offers a testable framework for discovering modifiable factors influencing development and aging.