Arithmetic of Electricity: A Practical Treatise on Electrical Calculations of All Kinds Reduced to a Series of Rules, All of the Simplest Forms, and Involving Only Ordinary Arithmetic ...N.W. Henley Publishing Company, 1909 - 162 стор. |
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Сторінка 29
... place . Rule 16. The resistance of any prism or cylinder of a substance is equal to its specific resistance multiplied by its length in centimeters and divided by its cross- sectional area in square centimeters . If the dimensions are ...
... place . Rule 16. The resistance of any prism or cylinder of a substance is equal to its specific resistance multiplied by its length in centimeters and divided by its cross- sectional area in square centimeters . If the dimensions are ...
Сторінка 30
... cross- sectional area equal to the area of one side of a plate . In a Bunsen battery the specific resistances of the solutions in inner and outer cells were made alike , each equalling 9 ohms . The central element was a 1⁄2 inch ...
... cross- sectional area equal to the area of one side of a plate . In a Bunsen battery the specific resistances of the solutions in inner and outer cells were made alike , each equalling 9 ohms . The central element was a 1⁄2 inch ...
Сторінка 31
... area of cross section to diameter . This may readily be taken from the table of wire factors , thus avoiding all calculation . Rule 17. The resistance in microhms of a wire of given diameter in centimeters is equal to the product of the ...
... area of cross section to diameter . This may readily be taken from the table of wire factors , thus avoiding all calculation . Rule 17. The resistance in microhms of a wire of given diameter in centimeters is equal to the product of the ...
Сторінка 32
... Cross - sectional area of b Resistance of a Specific Resistance of b Length of b Cross - sectional area of a Rule 18. Substitute in the above expression the values of any factors given . Substitute for factors not given or required the ...
... Cross - sectional area of b Resistance of a Specific Resistance of b Length of b Cross - sectional area of a Rule 18. Substitute in the above expression the values of any factors given . Substitute for factors not given or required the ...
Сторінка 33
... cross sectional area of the known wire , thus : Resistances : 23 10.82 Lengths : 1 2 Areas : Unknown 702 As the ... cross- sectional area 4 square millimeters to have the same resistance as a wire of pure copper 1000 yards long , of ...
... cross sectional area of the known wire , thus : Resistances : 23 10.82 Lengths : 1 2 Areas : Unknown 702 As the ... cross- sectional area 4 square millimeters to have the same resistance as a wire of pure copper 1000 yards long , of ...
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Загальні терміни та фрази
50 cents 50 ohms 50 volts air gaps alternating current ampere turns ance appliances armature core battery C. G. S. units calculated calories capacity cells in parallel cells in series circular mils coefficient of leakage coil conductance conductor copper coulombs cross-sectional area cycles per second difference of potential distance divided drop dynamo efficiency electromotive force energy engines EXAMPLE expressed external circuit factors farad field resistance fractions given gives gram heat developed horse power horse-power inductance internal resistance joules kilogram-meter lamps in parallel leads length lines of force lines per square magnet core magnetic circuit meter microfarad microhms mils in diameter motor multiplied number of cells number of turns Ohm's law ohms resistance permeability permeance proportion ratio of conversion reciprocal reduced reluctance Rule 55 Rules 30 sectional area shunt Solution specific resistance square centimeter square inch tion turns of wire voltage weight wrought iron
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Сторінка 50 - This loss as previously explained, is equal to the square of the current multiplied by the resistance. The...
Сторінка 13 - The strength of the current is equal to the electro-motive force divided by the resistance...
Сторінка 57 - Specific Heat. The specific heat of a substance is the ratio of the heat required to raise the temperature of unit weight of the substance 1 deg.