Physics 1 Problem Solutions 253

Physics 1 Problem Solutions 253 - Chapt 33 Alternating...

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Chapt. 33 Alternating Current or AC 249 033 qmult 00140 1 1 4 easy memory: unit of frequency 5. The MKS unprefixed unit of frequency is the: a) kilovolt (kV). b) volt (V) c) revolution per minute (RPM). d) hertz (Hz). e) kilohertz (kHz). 033 qmult 00150 1 1 3 easy memory: standard north american frequency 6. The optimum choice of AC frequency for a particular application probably depends on many things. But for a power grid, one must have a standard frequency which is reasonably good for may applications. In the early days of power grids many frequencies were used by the pioneering power plants. Frequencies between 16 . 666 ... Hz and 133 . 333 ... Hz have used. The Niagara Falls hydropower plants generated 25 Hz for a long time which is a bit too low for lighting: there is a detectable flicker to the eye. Coventry, England once using the oddball value 87 Hz. But in the course of the 20th century, an overall optimum frequency of about 50 Hz was arrived at. In Europe, 50 Hz exactly became the standard probably because it seemed sort of metric. In North America, exactly was settled probably since it seemed most Sumerian. Most of
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