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Lessons in Practical Electricity; Principles, Experiments, and Arithmetical Problems, an Elementary Text-Book

Lessons in Practical Electricity; Principles, Experiments, and Arithmetical Problems, an Elementary Text-Book


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...ever required is 75 per cent, of that taken when the whole installation is at work? Aris. 17.19 H. P. 10. Two arc lamps of 2000 and 1200 C. P., having a hot resistance of 6 and 3 ohms respectively, and an incandescent lamp with 18 ohms resistance, are all placed in parallel across a pair of mains. An ammeter in the main circuit indicates 20 amperes. (-) What current is each lamp receiving? (6) What is the difference of potential between the mains? (c) What is the power absorbed by each lamp? (d) How many candles per watt in the 2000 C. P. lamp? Ans. (a) 12, (, 2 amperes; (6) 36 volts, P. D.; (c) 432, 216, 72 watts; (d) 4.6 C. P. 11. The mean effective steam pressure from an indicator card is 50 pounds; the speed of the engine, 290 revolutions; length of stroke 10 inches; area of piston head 0.75 square foot. What horse power is developed by the engine? Ans. 75.927 H. P. 12. How many watts are expended in an arc lamp having a hot resistance of 4.5 ohms and requiring 50 volts? Ans. 555 watts. 13. What is the current flowing through an electromagnet having a resistance of 50 ohms and requiring 200 watts? Ans. 2 amperes. 14. What is the maximum power obtainable from aGrenet cell of 2 volts, E. M. F. and an internal resistance of.02 ohm? Ans. 200 watts. 15. How many cells are required for maximum economy of installation to operate an electromagnet requiring 20 watts? Each cell has an E. M. F. of 2 volts and an internal resistance of.5 ohm. Ans. 10 cells. 16. If the magnet in question 14 has a resistance of 5 ohms and requires 10 volts, what is the best arrangement of the cells and what is the efficiency? Ans. 80 %. LESSON XX. MEASUREMENT OF PRESSURE, Electromotive Force and Potential Difference--Hydraulic Analogy to Illustrate Volts Lost--Volts ...


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Product Details
  • ISBN-13: 9781236177094
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 150
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1236177096
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 281 gr


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