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Related Concept Videos

Resistance01:19

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 Law01:19

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 Law01:21

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 through the device is...
Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
Resistivity01:22

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:
Resistance and Conductance01:25

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 length...

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Related Experiment Video

Updated: May 30, 2026

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance
10:51

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

Published on: September 26, 2017

Conceptualizing resistance.

Natalie Armstrong1, Elizabeth Murphy

  • 1University of Leicester, UK.

Health (London, England : 1997)
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

This study explores how individuals resist public health regulations and surveillance. It reveals nuanced forms of resistance beyond outright rejection, challenging assumptions about agency in health promotion.

Related Experiment Videos

Last Updated: May 30, 2026

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance
10:51

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

Published on: September 26, 2017

Area of Science:

  • Sociology of Health
  • Public Health Policy
  • Governmentality Studies

Background:

  • Sociological research in the 1990s applied Foucault's governmentality concepts to health promotion and public health.
  • Public health discourses were viewed as power/knowledge regimes for regulating and surveilling individuals and populations.

Purpose of the Study:

  • To investigate the extent and forms of resistance to public health regimes.
  • To alert empirical researchers to subtle manifestations of resistance in health and healthcare.
  • To problematize simplistic views of agency and resistance in health promotion.

Main Methods:

  • Review of Foucault's concepts of resistance.
  • Analysis of empirical studies on health and illness incorporating resistance.
  • Examination of resistance within and outside health professional encounters.

Main Results:

  • Resistance to health regimes is complex and multifaceted.
  • Adherence to health advice does not necessarily negate individual agency.
  • Resistance can manifest in subtle ways, not always involving outright rejection of interventions.

Conclusions:

  • Resistance to public health power/knowledge regimes is possible and varied.
  • Recognizing nuanced resistance is crucial for understanding health behaviors.
  • Avoid assigning normative qualities to resistance; focus on its diverse expressions.