Pun-hon Ng et al 2009 Phys. Educ. 44 639 doi:10.1088/0031-9120/44/6/012
Pun-hon Ng1, Siu-ling Wong2 and Se-yuen Mak1
Show affiliationsIn this article, we describe a simple method which can be used to measure the efficiency of a low power dc motor, a motor-converted dynamo and a coupled motor–dynamo module as a function of the speed of rotation. The result can also be used to verify Faraday's law of electromagnetic induction.
41.20.Gz Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
Issue 6 (November 2009)
Received 9 July 2009, in final form 23 July 2009
Pun-hon Ng et al 2009 Phys. Educ. 44 639
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