By Percy Williams Bridgman
Read or Download A Comparison of Certain Electrical Properties of Ordinary and Uranium Lead (1919)(en)(3s) PDF
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This publication constitutes the refereed complaints of the eleventh overseas Workshop on summary nation Machines, ASM 2004, held in Lutherstadt Wittenberg, Germany, in could 2004. The 12 revised complete study papers awarded including four invited papers have been rigorously reviewed and chosen for inclusion within the ebook.
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Extra info for A Comparison of Certain Electrical Properties of Ordinary and Uranium Lead (1919)(en)(3s)
A, B, and C are supposed to be three stations connected B and B C. At each station by the overhead conductors A A a key, K, a sounder, S, and a switch, s. At there is a battery, F, one pole of which goes to the key and the other is there is PRACTICAL NOTES FOR ELECTRICAL STUDENTS. 35 connected to the earth, say by a large metal plate buried in The similar earth connection is made at C. the ground. switches have each two positions when turned to the right, as at B, they break connection between the key terminals ; and A : when turned to the left they re-establish it by making conThe keys remain up while at rest through the tact at c.
A Example. copper wire 600 yards long and 0'25m. in diameter has a conductivity 96 per cent, that of pure copper. What will be its resistance at the standard temperature ? The sectional area is in this case of a cylindrical wire, not a strand, strictly 0-25xO'25xO-7854, or 0-0490 square inch, so that its weight per statute mile will be 0*049 x 20,000, or 9801b. approximately. The resistance of a statute mile of pure weighing one pound will be found in electrical be 872 ohms at the standard temperature, which A wire of for overhead land lines is generally taken at 60 F.
FOR ELECTRICAL STUDENTS CHAPTER 33 V. CURRENT. 42. Effect of "Opening" or "Closing" a Circuit. Having examined the nature of electromotive force as supplied by batteries, and of resistance, we are now in a position to deal with the laws which relate to the current which flows in any given circuit, laws which are among the simplest yet most important considerations of the subject. Eeverting to our typical form of simple cell at Fig. 1, page 4, we saw that no current flowed in the circuit B E F G H if the wire F G H were severed at any point.