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Electrical measurements - folk.uio.no
KJM-MENA 4010. Electrical measurements Emphasising simple methods and instruments, materials aspects, electrochemistry, and impedance spectroscopy Truls Norby Department of Chemistry, University of Oslo FERMIO. Gaustadall en 21. NO-0349 Oslo, Norway 1. Welcome to KJM-MENA4010, Module 2; Electrical measurements In this module we will learn the most important principles of making Electrical measurements in general, , to obtain voltages and currents using the appropriate instruments and connections, and to understand and minimize sources of error. Furthermore, we will discuss selected Electrical measurement methods used to obtain chemical and physical information of liquids, solids, and interfaces. In addition to DC. methods we will focus on AC measurements and impedance spectroscopy. As practical skills we aim at the end of the course to - Be able to perform simple Electrical measurements of voltage, current, and resistance, as well as more sophisticated, scientific Electrical measurements , - master handheld and more accurate stationary multimeters and understand their differences, - have some knowledge of use of AC signals, AC generators, and an oscilloscope, - have some knowledge of use of a potentiostat/galvanostat, - hav
5 Some definitions relating to voltage and current Voltage and current Voltage, U, is the difference in electrical potential, φφφφ, between two locations: U = ∆φ = φ2 - φ1.The unit for voltage U is V (volt). Electrical field, E, is the negative of the gradient in electrical potential, i.e. it is defined to be directed from positive to negative pole: E = -dφ/dx.
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