পাতা:বিদ্যুৎ-তত্ত্ব শিক্ষক.djvu/৫১৩

বিদ্যুৎ-তত্ত্ব শিক্ষক 8ఖe; RADIAN = 18oo / m = 57°29:78° = 57° 17'45" = 2o6265". SECOHIM. A unit of self-induction = 1 sco × 1 ohm. THERM = small calories=(obsolete.) THERMAL UNIT, BRITISH = The ' quantity of heat required to warm one pound of water at its temperature of maximum density one degree Fahren heit = 252 gram-calories. * VOLT. The unit of electromotive force (E. M. F.) The international volt-is “the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere. The value of the E. M. F. of the Weston Normal cell is taken as I.O183 international volts at 20°C. = io" E, M. U = 1/300 E. S. U VOLT-AMPERE. Equivalent to Watt/Power factor. WATT. The unit of electrical power = Io' units of power in the C. G. S. system. It is represented sufficiently well for practical use by the work done at the rate of one joule per second. Watts = volts x amperes = ampereso x ohms = volts”/ ohms (direct current or alternating current with no phase difference). Wats x seconds = Joules. WEBER; A name formerly given to the coulomb. WORK in ergs = dynes x cm. Kinetic energy in ergs = grams x (cm./sec, )*/2. Y Ꭵ•.ᎪᎡ. days, hours, minutes, seconds. Anomalistic year = 365 6 • I 3 48 Sidereal , - 365 6 Q 9°314 Ordinary , = 365 5 48 4б°4 Tropical 2.9 same as the ordinary year.