Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 292
57.845 ohms (a).R = 55 ohms, T for copper wire = .002156, F.° =94 - 70 = 24° rise.By Formula (101) Ri= R - (R X T X F.° fall) = 55-(55 X .002156 X 80) =51.442 ohms (b).R = 55 ohms, T = .002156, F.° = 70° — 40° = 30° fall. 263. Fuses and Cut-OutS.—When a piece of copper andlead wire of the same size… … it will require a temperature of 1996° F. to melt the copper.Lead containing a small percentage of tin is used for electricfuses on account ofthe low tempera-ture at which itmelts. A fuse con-sists of such a lead-en wire or stripwhich is inserted inseries with the cir-cuit it is desired toprotect,…
Electricity · Magnetism
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