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BASIC CONCEPTS

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Courtesy NASA, 2009

THE LEARNING GOALS FOR THIS CHAPTER ARE:

Image Review the SI system of units and standard prefixes

Image Know the definitions of basic electrical quantities: voltage, current, and power

Image Know the symbols for and definitions of independent and dependent sources

Image Be able to calculate the power absorbed by a circuit element using the passive sign convention

Hubble Space Telescope If you were asked to identify the top engineering achievements that depend on currents, voltages, and power in electrical systems, would NASA’s Hubble Space Telescope make your list? It should. Launched over 20 years ago into an orbit 375 miles above the Earth’s surface, the Hubble Telescope avoids distorting effects of the atmosphere and gives significant new data about the universe. It features multiple channels having many intricate electrical systems that detect different wavelengths ...

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