Electric Heating by Edwin James Houston

By Edwin James Houston

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Due to resistance, expended in is heating the conductor, while the activity which is the product of current strength and counter E. M. , due induction, is This magnetically. what is work ex- to may be taken as a general law for, whenever a counter E. M. F. in a circuit is due to ; thermo-electric, chemical, or magnetic ef- the activity of the current on that C. E. M. F. is expended thermo- electricfects, when magnetically; but the C. E. M. F. is merely that due to the drop of pressure in the conductor, ally, chemically, or the activity in this drop is expended as thermal activity.

The resistivity in ohms, at the temperature of the measurement, will then be the resistance multiplied by the cross- sectional area of the wire in square centimetres divided by the length of the wire in centimetres. 56 ELECTBIC HEATING. The effect of temperature on metallic conductors sistivity. Nearly is all all pure to increase the re- alloys also increase in their resistivity with increase in tem- perature, though less rapidly than their few specially pure component metals. A prepared alloys, such as platinoid, have a very small increase of resistivity with temperature, and are, therefore, in special request for the manufacture of permanent resistance coils, whose resistances are to remain as nearly constant as possible; while one or two alloys have been prepared whose resistivities are either not effected by temperature, or have a slight a positive or negative coefficient; i.

Or electromotive M. F. ) and is force, also ex- pressed in joules-per-second, or in watts. Thus, when 100 coulombs pass through an under a pressure of 50 a total work of 5000 joules will be electric circuit volts, done, and if this work be expended in one second, the activity during that time will If the same total flow be 5000 watts. take place steadily in 50 seconds, the flow-per- second would be 2 coulombs, and the activity, 50 x 2 = 100 volt-cou- lombs -per -second, or 100 watts. An electric flow may be expressed in coulombs-per-second; i.

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