TABLE 382. ELECTRICAL EQUIVALENTS. 311 



Abbreviations: int'n'l, international; emu, electromagnetic units; esu, electrostatic units; 

 cgs, centimeter-gram-second units. (Taken from Circular 60 of U. S. Bureau of Standards, 

 1916, Electric Units and Standards.) 



RESISTANCE : 



i international ohm = 

 i . 00052 absolute ohms 

 i . oooi int'n'l ohms (France, before 191 1) 

 i. 00016 Board of Trade units (England, 



1903) 



1.01358 B. A. units 

 1.00283 "legal ohms" of 1884 

 i . 06300 Siemens units 



i absolute ohm = 



0. 99948 int'n'l ohms 

 i " practical " emu 

 io 9 cgs emu 



1 . i T 24 x io~ 12 cgs esu 



CURRENT: 



i international ampere - 



0. 99991 absolute ampere 



1 . 00084 int'n'l amperes (U. S. before 1911) 

 1.00130 int'n'l amperes (England, before 



1906) 

 i. 00106 int'n'l amperes (England, 1906- 



08) 

 i.oooio int'n'l amperes (England, 1909- 



10) 

 1.00032 int'n'l amperes (Germany, before 



1911) 

 i . 0002 hit 'n'lamperes (France, before 1911] 



i absolute ampere - 



i 00009 int'n'l amperes 

 i "practical" emu 

 o. i cgs emu 

 2.9982 X io 9 cgs esu 



ELECTROMOTIVE FORCE: 



i international volt = 

 . 00043 absolute volts 

 .00084 int'n'l volts (U. S. before 1911) 

 .00130 int'n'l volts (England, before 



1906) 



.00106 int'n'l volts (England, 1906-08) 

 .00010 int'n'l volts (England, 1909-10) 

 .00032 int'n'l volts (Germany, before 



1911) 

 i. 00032 int'n'l volts (France, before 1911 



i absolute volt = 

 0.99957 int'n'l volt 

 i "practical " emu 

 io 8 cgs emu 

 o. 0033353 cgs esu 



QUANTITY OF ELECTRICITY: 



(Same as current equivalents.) 

 i international coulomb = 



1/3600 ampere-hour 



1/96500 farad ay 



CAPACITY: 



i international farad - 

 0.99948 absolute farad 



i absolute farad = 

 1.00052 int'n'l farads 

 i " practical " emu 

 lo" 9 cgs emu 

 8.9892 x io u cgs esu 



INDUCTANCE: 



i international henry = 

 1.00052 absolute henries 



i absolute henry = 

 o. 99948 int'n'l henry 

 i " practical " emu 

 io 9 emu 

 1. 1124 x io~ 12 cgs esu 



ENERGY AND POWER: 



(standard gravity = 980. 665 cm/sec/sec.) 

 i international joule = 

 i . 00034 absolute joules 



i absolute joule = 

 o. 99966 int'n'l joule 

 io 7 ergs 



o. 737560 standard foot-pound 

 o. 101972 standard kilogram-meter 

 0.277778x10"* kilowatt-hour 



RESISTIVITY: 



i ohm-cm = o. 393700 ohm-inch 



= 10,000 ohm (meter, mm 2 ) 

 = 12,732.4 ohm (meter, mm) 

 = 393) 7 microhm-inch 

 = 1,000,000 microhm-cm 

 = 6,015,290 ohm (mil, foot) 



i ohm (meter, gram) 

 pound) 



5710.0 ohm (mile 



MAGNETIC QUANTITIES: 



i int'n'l gilbert - o. 99991 absolute gilbert 

 i absolute gilbert = i . 00009 int'n'l gilberts 

 i int'n'l maxwell = i . 00043 absolute maxwells 

 i absolute maxwell = o. 99957 int'n'l maxwell 

 i gilbert = o. 7958 ampere-turn 



i gilbert per cm =o. 7958 ampere-turn per 



cm 

 - 2 . 021 ampere-turns per 



inch 

 i maxwell = i line 



= io~* volt-second 

 i maxwell per cm 2 = 6. 45 2 max wells per in 2 



SMI-THSONIAN TABLES. 



