Effective Ammeter-Voltmeter Method

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Teresa Seixas (Author) FCUP; M. A. Salgueiro da Silva (Author) FCUP

Journal

Title: PHYSICS TEACHER

Vol. 58

Pages: 502-503

ISSN: 0031-921X

Publisher: American Institute of Physics

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Scientific classification

CORDIS: Physical sciences > Physics ; Social sciences > Educational sciences

FOS: Natural sciences > Physical sciences ; Social sciences > Educational sciences

Other information

Authenticus ID: P-00S-RAC

DOI: 10.1119/10.0002072

Abstract (EN): The ammeter-voltmeter method is a general method for measuring electrical resistances that is widely used in the introductory physics laboratory, mostly for pedagogical reasons. Simultaneous readings of current (I) and voltage (V) allow the calculation of electrical resistance (R) using Ohm's law: R = V/I. It is implicitly assumed that electrical wire and contact resistances present in the measuring circuit can be neglected. Two measuring configurations are usually proposed, depending on the relative values of R and the internal resistances of the ammeter and voltmeter. In this work, we highlight the deficiencies of this standard approach and propose a modified ammeter-voltmeter method that can be used with more generality and better performance. © 2020 American Association of Physics Teachers.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 2