Quotation from: General Science

Written by: Bertha M. Clark


In Section 299 we learned that substances differ very greatly in the
resistance which they offer to electricity, and so it will not
surprise us to learn that while it takes 300 feet of iron telegraph
wire to give 1 ohm of resistance, it takes but 39 feet of number 24
copper wire, and but 2.2 feet of number 24 German silver wire, to give
the same resistance.


NOTE. The number of a wire indicates its diameter; number
30, for example, being always of a definite fixed diameter,
no matter what the material of the wire.

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