. Electricity simplified. The practice and theory of electricity ... ent of one coulomb per second, one which wouldbe maintained through a resistance of one ohm byone volt potential difference between its ends. Thecombination just cited for the coulomb, therefore,involves a current of one ampere. A copper wire nine one-hundredths (yfg-) of aninch in diameter and eight hundred and thirty (830)feet long, connected between the terminals of a 64 ELECTRICITY SIMPLIFIED. Daniell cell of no resistance, which would be one ofinfinite size, would pass a current of one a cell is of course inc
. Electricity simplified. The practice and theory of electricity ... ent of one coulomb per second, one which wouldbe maintained through a resistance of one ohm byone volt potential difference between its ends. Thecombination just cited for the coulomb, therefore,involves a current of one ampere. A copper wire nine one-hundredths (yfg-) of aninch in diameter and eight hundred and thirty (830)feet long, connected between the terminals of a 64 ELECTRICITY SIMPLIFIED. Daniell cell of no resistance, which would be one ofinfinite size, would pass a current of one a cell is of course inconceivable. A dynamoof negligible resistance might easily boused to main-tain the requisite potential difference ( volts) forthe above wire. A greater potential difference will maintainthrough the same resistance an exactly proportion-ately greater current, and vice versa; a greater resist-ance will diminish the current in exact proportion,and vice versa. The ampere is a unit of rate, and the expression ofone or ten amperes per second is redundant and Fig. 7.—The Miners Inch as an Analogy for the Ampere. The ampere is exactly analogous to a well-knownunit of water flow, the miners inch/ This is aunit used by miners and irrigators in the Western THE MINERS INCH. 65 and Pacific States. It denotes the rate of flow ofwater which, under a head of six inches, will passthrough a hole one inch square in a board two inchesthick. Let this head of water represent a volt, and letthe resistance of the hole represent an ohm; then theminers inch would represent a current of oneampere. One miners inch per second or per hour isredundant, as everything is said when the simple inch is expressed. It may flow for a second or anhour. As we may speak of an ampere-second/ acompound unit, which we have just seen is thecoulomb, so we may speak of a miners inch-second, which is .1937 gallon of water. Electric Eorce, Work, and Energy. Energy and work in the mechanical world are inpractice
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Keywords: ., bookcentury1800, bookdecade1890, bookidel, booksubjectelectricity
