UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2012 Meeting


Section: Educational Physics


Title:
Teaching and Assessing Magnetic Torques on Current Loops Using „STYLE” - STudY of a Simple Electric Motor


Authors:
M. DAFINEI(1), Delia Constanta DAVIDESCU(1,2), A. DAFINEI(1), S. ANTOHE(1)


Affiliation:
(1)University of Bucharest, Faculty of Physics, Atomistilor Street 405, P.O. Box MG 11, 077125, Bucharest-Magurele, Romania

(2)CNEE-Ministry of Education, Research and Youth


E-mail
asdafinei@yahoo.com


Keywords:
teaching and assessing tools, electricity, magnetic forces on current carrying wires, applying physics


Abstract:
In the paper we present a didactical tool dedicated to the study of magnetic forces on current carrying wires. The tool is based on a device in which a rotating rectangular conductor frame, through which a current is passed, is disposed in the magnetic field of a permanent magnet. An ingenious system of electrical contacts, ensure the maintenance of mechanical torque of magnet field on conducting wires. The teaching tool has an appropriate design so that it can be applied to the students of different levels of training and interest. At a first level, the tool allows to show the existence of mechanical motion due to electrical reasons. At a second level, the study of the device allows the determination of links between mechanical and electrical characteristics. At the third level, the most important, a theoretical analysis of operation of the simple electric motor, allows a better understanding of a very important chapter of Electricity. Finally, at the fourth level, the teaching tool proposes to use the device to study the dependence of the velocity of a wing of wind - an interesting topic for understanding the wind turbines. To verify the teaching tool, it was applied to students of regular pre - university classes. After that, the instrument was successfully applied as assessing tool in an experimental problem of an international competition. Note: Romanian Ministry of Education, Research and Youth supported this work under Project FSE-POSDRU ID: 88/1.5/S/56668.