Lecture-Notes On the Theory of Electrical Measurements. Prepared for the Third-Year Classes of the Cooper Union Night-School of Science

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Resistance is proportional to the length of the con- ductor and inversely proportional to its cross-section.
Specific Resistance. — Different materials forming conductors of same length and cross-section vary greatly in resistance. The specific resistance of a substance may be defined as the ratios of the resist- ance of a conductor of that substance to the resist- ance of a conductor of same length and cross-section of some other substance, taken as a standard.
Or, the absolute specific resist
...ance of a substance is the resistance of a centimetre cube of that sub- stance taken between opposite faces.
Copper and silver have the least specific resistance.
Other metals have varying specific resistances. Iron has about six times and mercury about sixty times the specific resistance of silver.
RESISTANCE AND OHM'S LA IV. 37 Liquids have much higher resistances. The resist- ance of the liquids used in galvanic batteries is from one to ten million times that of copper.
Ohm's Law states that the current flowing in a conductor is directly proportional to the potential difference, and inversely proportional to the resist- ance, or, since we have yet to choose a unit of resist- ance, we may put c-=| (28) Unit Resistance.


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