Download PDF by Alexander Gray: Principles and Practice of Electrical Engineering

By Alexander Gray

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S. f. that is generated in a coil of one turn when the flux threading the coil is changing at the rate of one line per sec. s. f. f. - 10~ 8 volts. That portion Generation of elecFIG. 12. tromotive force. Right Hand Rule: thumb motion; fore- of the coil wherein the induced is the conductor xy which cuts the lines of force, and the quantity dfyjdi the rate at which the lines are cut. f. is actually 13. f. The direction of the current in xy, as determined by the right-hand rule, is shown in Fig. 13 for the case where the coil is moving downward and the number of lines of force threading the coil is decreasing.

Current in line = 30 X 1000 - = 600 50 amp. 6 ohms C. 7 ohms per cir. 6 ohms per X cir. 6 X4 X5280- = cir. From which The loss in cir. 6 ohms mils 370,000 30 volts X 50 amp. 1500 watts 5 per cent, of the N power delivered. C. CHAPTER VI RHEOSTATS AND RESISTORS 32. Rheostats. A rheostat is an adjustable resistance of such a form that it can be conveniently used. In the rheostat shown in Figs. 26 and 27, the resistance ab is tapped at eight FIG. 26. SUTE FIG. 27. Sliding contact type of rheostat.

Work done = 2000 X 300 1 min. = 600,000 ft. Ib. PRINCIPLES OF ELECTRICAL ENGINEERING 16 6. 2 per 60 per sec. 000c. to the hoist Since watts and the current 2. 1 18 1 ' kw = = * X 1000 = 110 X amperes 182. amp. at 110 volts. p. = 20 kw. 6 = \j d. sec. ft. Ib. ft. Ib. -hour. 55 kw. 6 cents What is 3. A 32-candle power, 110-volt tungsten lamp requires 40 watts. -hour? amperes = power = = = used energy cost of energy = 4. 6 kw. 4 is kw. -hour? energy required Now amp. watts 12 cents. amp. at 110 volts.

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Principles and Practice of Electrical Engineering by Alexander Gray

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