Solenoids Electromagnets And Electro Magnetic Windings 223 Illustrations
Solenoids Electromagnets And Electro Magnetic Windings 223 Illustrations
Charles Reginald Underhill
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141729 International ohm at C. Hence, a wire one foot long and 0. 000174353 square inch in cross- section has a resistance of 0. 0431991 International ohm at C. From this it follows that a wire 0. 001 inch (1 mil) in diameter (0. 0000000785398 square inch, or 1 circular mil, in cross-section) will have a resistance of 9. 58992 International ohms per foot at C. , or 10. 3541 ohms per foot at 20 C. Or 68 F. 214 SOLENOIDS Therefore, in English units, P F = 30, 269 x 10-*
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