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Jeffery, Rondo N.; Farhang, Amiri – Physics Teacher, 2016
The classroom jumping ring demonstration is nearly always performed using alternating current (AC), in which the ring jumps or flies off the extended iron core when the switch is closed. The ring jumps higher when cooled with liquid nitrogen (LN2). We have performed experiments using DC to power the solenoid and find similarities and significant…
Descriptors: Science Experiments, Physics, Motion, Kinetics
Overduin, James; Polyak, Viktor; Rutah, Anjalee; Sebastian, Thomas; Selway, Jim; Zile, Daniel – Physics Teacher, 2017
The 1990 film "The Hunt for Red October" (based on Tom Clancy's 1984 debut novel of the same name) featured actors like Sean Connery and Alec Baldwin, but the star of the movie for physicists was a revolutionary new magnetohydrodynamic (MHD) marine propulsion system. The so-called "caterpillar drive" worked with no moving…
Descriptors: Physics, Introductory Courses, Science Instruction, Demonstrations (Educational)
Mungan, Carl E. – Physics Teacher, 2014
A Genecon is an inexpensive hand-cranked dc electric generator. You can use it to charge a one-farad supercapacitor. If you stop cranking the handle, the capacitor will discharge, sending a current into the Genecon and thereby causing the handle to start turning as an electric motor. How does the current direction compare before and after you stop…
Descriptors: Demonstrations (Educational), Physics, Motion, Mechanics (Physics)
Gfroerer, Tim – Physics Teacher, 2013
Typical commercial solar panels consist of approximately 60 individual photovoltaic cells connected in series. Since the usual Kirchhoff rules apply, the current is uniform throughout the circuit, while the electric potential of the individual devices is cumulative. Hence, a solar panel is a good analog of a simple resistive series circuit, except…
Descriptors: Physics, Power Technology, Equipment, Energy Education
Haugland, Ole Anton – Physics Teacher, 2014
The bicycle generator is often mentioned as an example of a method to produce electric energy. It is cheap and easily accessible, so it is a natural example to use in teaching. There are different types, but I prefer the old side-wall dynamo. The most common explanation of its working principle seems to be something like the illustration in Fig.…
Descriptors: Science Education, Teaching Methods, Power Technology, Energy Education
Turner, Lou – Physics Teacher, 2009
In discussing motors, one college textbook says, "As the coil (of a motor) rotates in a magnetic field, a back emf is generated that tends to counter the emf that supplies the current." This is a true statement, but it does little to enhance student understanding of how and why it is created. In this paper, I will explain how to take students step…
Descriptors: Physics, Science Instruction, Scientific Concepts, College Science