Physics 1 Problem Solutions 252

Physics 1 Problem Solutions 252 - Chapt. 33 Alternating...

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Unformatted text preview: Chapt. 33 Alternating Current or AC Multiple-Choice Problems 033 qmult 00100 1 1 3 easy memory: AC definition 1 1. Alternating current or AC means that current and potential vary about a mean value (usually zero) and usually (but not always) a) trapezoidally. b) parabolically. c) sinusoidally. d) geometrically. e) wretchedly. 033 qmult 00110 1 1 2 easy memory: sawtooth and square-wave 2. Sawtooth and square-wave variation of current and potential can be referred to as , but they are not what one ususally means by the term. a) DC b) AC c) HVDC d) HIFI e) WIFI 033 qmult 00120 1 1 5 easy memory: victory of AC 3. AC won the war of the currents in the 1880s as the preferred method of large electrical energy transmission. But this wasnt because AC is more naturally produced by electrical generators and used by electrical motors than DC. Efficient conversions between AC and DC exist and saying that AC is more natural for generators and motors is arguable actually. No AC won because long-distance electrical energy transmission is most efficient at high potential...
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