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ELECTRICAL ACTION 3
Direct or Alternating Current, page 17
47. What is the accepted abbreviation for alternating current :
48. What is the direction of flow of a.c. 1 ~*r»vu *?lU±
49. How often does the direction of flow change in ordinary
commercial currents ?
50. Direct current being superior for lighting purposes, why i
not more generally generated?
51. Can a.c. or d.c. voltage be raised or lowered after gen
eration with equal ease and at equally low expense
52. How may electrical power be calculated in terms of hi
power? - ?
53. Voltage and horse power known, how calculate watts and
54. May a wire carry its amperage capacity at any voltage it
may be insulated to retain?
55. What effect has increased voltage upon current in power
delivery? i ' , f*»+*'' \
56. Why may power be transported more cheaply at high than
at low voltage?
57. By means of what instrument may voltage of a.c. be raised
or lowered after generation ?
z Alternating Current Action, page 18
58. Describe the flow of a.c.
59. What is a "cycle"? Of what does it consist?
60. What is meant by "current frequency"?
61. At how low frequency may light without visible flicker be
produced? ...
62. For what may low cycle a.c. be used to advantage?
63. What cycle current is most frequently used where both
light and power are supplied ?
64. Is there invisible flicker in a.c. regardless of how high the
frequency may be? -><
65. What do the vertical and horizontal lines in Fig. 4 represent? -J56. Explain meaning of triangles above and below line O, Fig. 4?^
What does each triangle side represent?
67. What does line O represent with regard to the triangles?
Two and Three-Phase Current, page 20
68. What is 2-phase current and what is its advantage?