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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...

Design Example: Frog Muscle Response

Design Example: Frog Muscle Response

A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...

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:

Resistors In Series

Resistors In Series

A resistor is an ohmic device that limits the flow of charge in a circuit. Most circuits have more than one resistor. If several resistors are connected together and connected to a battery, the current supplied by the battery depends on the equivalent resistance of the circuit. The equivalent resistance of a combination of resistors depends on both their individual values and how they are connected. The simplest combination of resistors is the series combination.
In a series circuit, the...

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Related Experiment Video

Updated: May 1, 2026

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms

Published on: December 9, 2015

[Pitfalls in determining resistance].

¹Institut für Medizinische Mikrobiologie und Infektionsepidemiologie, Liebigstr. 21, 04103, Leipzig, Deutschland, acr@medizin.uni-leipzig.de.

Medizinische Klinik, Intensivmedizin Und Notfallmedizin

|April 4, 2014

Summary

This summary is machine-generated.

Choosing the right antimicrobial therapy is key to reducing infection-related deaths. Reliable antibiograms, including minimal inhibitory concentration values and European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidelines, ensure optimal antibiotic selection and prevent treatment failures.

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Last Updated: May 1, 2026

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms

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Published on: December 9, 2015

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Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises

Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises

Published on: January 18, 2011

Area of Science:

Microbiology
Infectious Diseases
Pharmacology

Context:

Optimizing antimicrobial therapy is critical for managing infections and improving patient outcomes.
Antibiograms are essential tools for guiding antibiotic selection.
Life-threatening infections necessitate detailed antimicrobial susceptibility data.

Purpose:

To emphasize the importance of reliable antibiograms for effective antimicrobial therapy.
To highlight the need for minimal inhibitory concentration (MIC) values in critical infections.
To advocate for adherence to European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidelines for susceptibility testing.

Summary:

Optimal antimicrobial therapy selection significantly impacts infection morbidity and mortality.
Reliable antibiograms, ideally with minimal inhibitory concentration (MIC) values, are fundamental for rational antibiotic selection, especially in severe infections.
Utilizing European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidelines for categorized results (susceptible, intermediate, resistant) is crucial to prevent therapeutic failures.

Impact:

Improved patient outcomes through targeted and effective antimicrobial treatments.
Reduced antimicrobial resistance by promoting appropriate antibiotic use.
Enhanced clinical decision-making in infectious disease management.