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Charging Ahead: An Itroduction to Electromagnetism (# PB155X)
Energize your next unit on electricity with hands-on activities to explain the fascinating phenomenon of electromagnetism. Students are introduced to the factors that determine the strength of electrical coils, and they use readily available materials to build a simple motor and a generator. Topics covered include circuit breakers, mag-lev... | | Data Compression: The Complete ReferenceGiambattista della Porta, a Renaissance scientist, was the author in 1558 of Magia Naturalis (Natural Magic), a book in which he discusses many subjects, including demonology, magnetism, and the camera obscura. The book mentions an imaginary device that has since become known as the “sympathetic telegraph.” This device was to have... | | Layers of the Earth (The Restless Earth)The Earth is made of layers, each with its own unique characteristics and processes that make it a vital part of the planet. The solid inner core, for example, is the farthest layer from the planet's surface, yet it provides much of the heat needed to fuel dramatic surface phenomena such as volcanoes and earthquakes. Likewise, the outer core... |
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