Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 113
Fig. 114 By Ohms law the resistance of the wire would be ^ = R = -^=125 ohms. And we have now to find from the wire tables a wire whichwill give 125 ohms resistance; or 62.5 ohms and 3920 turns oneach bobbin. Several wires may be tried by calculation, taking the biggestsection which will fit into… … Fig. 115 We may take the number of turns required on one bobbin asequjil to 4000, to avoid fractions. 4000x44 inches = 4888 yards of wire. Lookinor alonethe table we findthis wire has 9.7ohmsper 1000 yards;therefore 4888 yardsX 97 = 47 ohms,while we require62.5 ; but this meansonly a slightly…
Electrical engineering · Electric power
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