$14.95
Learn how the principals of Newtonian Relativity, Faraday’s Law of Electromagnetic Induction, Snell’s Law of Refraction and Fermat’s Principle of Least Time are incorporated into the design of the NightStar Flashlight.
The NightStar Flashlight Physics Guide provides a detailed description of the engineering elements integrated into the NightStar capacitor powered shake flashlight and is a physics course onto itself. Learn about the nature of magnetism, electrodynamics, energy, light and optics through this easy to read guide written for high school level students; although, much of the material can be understood by 9th graders and up.
Many of the components and mechanisms of the NightStar flashlight aptly demonstrate the importance of physics principles. The repulsion of the mobile magnet by the two fixed end magnets illustrates ferromagnetism. The generation of alternating electric current in the coil by the moving magnet demonstrates magnetomotive induction. The alternating electric current is converted to a direct, or unidirectional, current by diode rectification. This energy is then conveniently saved for later use by capacitive energy storage. The energy carried in the electric current is converted to blue light by radiative recombination in the light-emitting diode. The phosphor converts some of the blue into other colors, illustrating fluorescence. Finally, the white light streaming in all directions is collected and projected forward into a useful beam by the reflector and lens demonstrating reflection and refraction, respectively.
Purchase at HaveLight.com
