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Ng, Pun-hon; Wong, Siu-ling; Mak, Se-yuen – Physics Education, 2009
In 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. (Contains 1 table and 8 figures.)
Descriptors: Energy, Science Instruction, Physics, Magnets
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Wong, Siu Ling; Mak, Se-yuen – Physics Education, 2008
We describe the design of a simple homemade apparatus for the measurement of the refractive indices of liquids and demonstration of refraction. A circular transparent plastic tank and a lazy Susan are held concentrically. A laser pointer is mounted on the lazy Susan with its laser beam pointing radially through the centre of the plastic tank.…
Descriptors: Lasers, Light, Optics, Physics