# Elements of Electricity: A Practical Discussion of the Fundamental Laws and Phenomena of Electricity and Their Practical Applications in the Business and Industrial World

American Technical Society, 1917 - Electric engineering - 242 pages

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Page 77 - In general, for any number of conductors connected in parallel, the joint resistance is found by taking the reciprocal of the sum of the reciprocals of the separate resistances.
Page 97 - If a circuit is made up of several different materials joined in series with each other, the resistance of the circuit is equal to the sum of the resistances of its several parts. In calculating the resistance of such a circuit, the resistance of each part should first be calculated, and the sum of these resistances will be the total resistance of the circuit.
Page 73 - ... potential throughout the circuit, and if the voltage between any two points of the circuit be measured, the emf obtained would depend upon the resistance included between these two points. For example, the voltage between points b and d would be found to be 72 + 36 = 108 volts, or between d and e, 36 volts, etc.
Page 76 - This formula may be stated as follows : The joint resistance of a divided circuit is equal to the product of the two separate resistances divided by their sum.
Page 151 - Ohm's law; that is, it is equal to the induced EMF divided by the resistance of the circuit. The number of lines of force which the conductor cuts per second may always be determined if we know the velocity of the conductor and the strength of the magnetic field through which it moves.
Page 96 - As the area of a circle is proportional to the square of its diameter, it follows that the resistances of round conductors are inversely proportional to the squares of their diameters.
Page 37 - I becoming negatively charged and o positively charged. As the plate carrying I, m, n, o, p, q rotates in the direction of the arrow the negative charge on...
Page 97 - Calculation of Resistance. From the preceding pages it is evident that resistance varies directly as the length, inversely as the cross-sectional area, and depends upon the specific resistance of the material. This may be expressed conveniently by the formula. in which .R is the resistance, L the length of the conductor, A the area of its cross section, and « the specific resistance of the material.
Page 61 - ... the polarization of the simple cell has been removed. The great advantage of the Daniell cell lies in the relatively high degree of constancy in its EMF (1.08 volts). It has a comparatively high internal resistance (one to six ohms) and is therefore incapable of producing very large currents, about one ampere at most. It will furnish a very constant current, however, for a great length of time; in fact, until all of the copper is driven out of the copper sulphate solution. In order to keep a...
Page 2 - Laws of Magnetic Attraction and Repulsion. In the experiment with the iron filings, no particular difference was observed between the action of the two poles. That there is a difference, however, may be shown by experimenting with two magnets, either of which may be suspended (see Fig.