The book Electrical Engineering Leaflets Advanced Grade was written by author Edwin J Edwin James Houston Here you can read free online of Electrical Engineering Leaflets Advanced Grade book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electrical Engineering Leaflets Advanced Grade a good or bad book?
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, that is, 1 pound of water raised from 68 to 69 F. , requires an expenditure of 1053 joules, so that, roughly, 1 B. T. U. = 1 kilojoule). Heat produced in resistance by electrical currents is either purposely developed, as in electric heaters or elec- tric furnaces, or incidentally and unavoidably developed, as in dynamo machinery and wires conveying currents. 202. The flow of heat through a conductor follows the same law as that which determines the flow of electricity through a conductor, i.... E. , Ohm's law. If 6, be the difference of temperature in degrees Centigrade, between two parallel plane surfaces of the conductor, and xS r, the thermal resistance of this portion of the con- ductor, then H, the strength of the thermal current, in joules per second, will be $, is determined as follows ; viz. , if y, be the thermal re- sistivity, Z, the length of the conductor in cms. , and, its cross-sectional area in square centimetres, then #=*-. A The thermal resistivity of a substance is the reciprocal of its thermal conductivity, and may be defined as being equal to the reciprocal of the amount of heat, expressed 195 in joules, which will traverse a cube of the material one cin.
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