687:
339:
682:{\displaystyle {\text{H}}={\dfrac {{\text{kg}}{\cdot }{\text{m}}^{2}}{{\text{s}}^{2}{\cdot }{\text{A}}^{2}}}={\dfrac {{\text{N}}{\cdot }{\text{m}}}{{\text{A}}^{2}}}={\dfrac {{\text{kg}}{\cdot }{\text{m}}^{2}}{{\text{C}}^{2}}}={\dfrac {\text{J}}{{\text{A}}^{2}}}={\dfrac {{\text{T}}{\cdot }{\text{m}}^{2}}{\text{A}}}={\dfrac {\text{Wb}}{\text{A}}}={\dfrac {{\text{V}}{\cdot }{\text{s}}}{\text{A}}}={\dfrac {{\text{s}}^{2}}{\text{F}}}={\dfrac {\Omega }{{\text{rad}}{\cdot }{\text{Hz}}}}={\dfrac {\Omega {\cdot }{\text{s}}}{\text{rad}}}}
1290:
29:
827:. A small air-core coil used for broadcast AM radio tuning might have an inductance of a few tens of microhenries. A large motor winding with many turns around an iron core may have an inductance of hundreds of henries. The physical size of an inductance is also related to its current carrying and voltage withstand ratings.
795:
The
International System of Units (SI) specifies that the symbol of a unit named for a person is written with an initial capital letter, while the name is not capitalized in sentence text, except when any word in that position would be capitalized, such as at the beginning of a sentence or in
280:
224:
942:
920:
887:
800:
1265:
861:
1319:
182:(1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as
857:
981:
1171:
816:
823:
can be used to calculate the inductance of many common arrangements of conductors, such as parallel wires, or a
1275:
60:
990:
314:
167:
1314:
891:
1229:
1270:
974:
820:
199:
163:
8:
1255:
936:
NIST Special
Publication 811: Guide for the Use of the International System of Units (SI)
211:
1293:
1179:
967:
1046:
310:
183:
1199:
1131:
912:
865:
46:
1308:
1260:
1184:
1121:
1111:
727:
42:
38:
935:
1204:
1161:
1146:
1101:
998:
815:
The inductance of a coil depends on its size, the number of turns, and the
755:
748:
179:
178:
turn, that coil has a self-inductance of 1 henry. The unit is named after
175:
125:
93:
275:{\displaystyle \displaystyle V(t)=L{\frac {\mathrm {d} I}{\mathrm {d} t}}}
1076:
1031:
195:
75:
1141:
1056:
1021:
836:
824:
699:
318:
134:
34:
1209:
1194:
1136:
1066:
1061:
1011:
734:
1224:
1126:
1036:
1016:
1006:
785:
720:
713:
330:
326:
207:
203:
171:
146:
142:
1239:
1234:
1219:
1096:
1091:
1086:
1071:
1026:
781:
769:
741:
706:
322:
138:
1214:
1156:
1151:
959:
762:
215:
28:
333:(A). Expressed in combinations of SI units, the henry is:
1189:
1116:
1106:
803:
recommends users writing in
English to use the plural as
776:
65:
917:
The NIST Reference on
Constants, Units and Uncertainty
656:
627:
603:
574:
559:
523:
499:
454:
416:
352:
342:
228:
227:
681:
274:
174:flowing through a coil produces flux linkage of 1
885:
819:of the material within and surrounding the coil.
1306:
913:"Essentials of the SI: Base & derived units"
858:"How Many? A Dictionary of Units of Measurement"
294:) is the resulting voltage across the circuit,
943:National Institute of Standards and Technology
933:
921:National Institute of Standards and Technology
801:National Institute of Standards and Technology
975:
313:based on four of the seven base units of the
198:of an electric circuit is one henry when an
1266:Historical definitions of the SI base units
934:Thompson, Ambler; Taylor, Barry N. (2008).
862:University of North Carolina at Chapel Hill
982:
968:
302:) is the current through the circuit, and
941:(Special Publication) (2008 ed.).
1307:
45:used to confine and guide the induced
963:
927:
855:
13:
659:
629:
306:is the inductance of the circuit.
261:
251:
14:
1331:
1289:
1288:
27:
810:
1320:Units of electrical inductance
1276:System of units of measurement
905:
879:
849:
238:
232:
1:
842:
315:International System of Units
189:
168:International System of Units
989:
7:
830:
796:material using title case.
10:
1338:
1284:
1248:
1170:
1045:
997:
121:
117:
99:
89:
81:
71:
59:
54:
26:
21:
1230:minute and second of arc
202:that is changing at one
186:(1791–1867) in England.
170:(SI). If a current of 1
1271:2019 revision of the SI
888:"A Princeton Companion"
886:Herbert S. Bailey Jr.
790:
683:
276:
684:
277:
218:across the inductor:
164:electrical inductance
16:SI unit of inductance
1172:Other accepted units
340:
225:
1256:Conversion of units
212:electromotive force
112:... is equal to ...
55:General information
1049:with special names
799:The United States
679:
677:
650:
621:
597:
568:
553:
517:
493:
448:
410:
272:
271:
131:
123:
1302:
1301:
1180:astronomical unit
676:
675:
670:
649:
646:
636:
620:
619:
609:
596:
595:
590:
580:
567:
566:
563:
552:
551:
540:
529:
516:
508:
503:
492:
484:
471:
460:
447:
439:
432:
422:
409:
400:
383:
369:
358:
346:
269:
162:) is the unit of
152:
151:
100:Conversions
1327:
1315:SI derived units
1292:
1291:
984:
977:
970:
961:
960:
954:
953:
951:
950:
940:
931:
925:
924:
923:. 12 April 2010.
909:
903:
902:
900:
899:
890:. Archived from
883:
877:
876:
874:
873:
864:. Archived from
853:
779:
772:
765:
758:
751:
744:
737:
730:
723:
716:
709:
702:
695:
688:
686:
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673:
672:
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651:
648:
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644:
642:
637:
634:
628:
622:
617:
616:
615:
610:
607:
604:
598:
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591:
588:
586:
581:
578:
575:
569:
564:
561:
560:
554:
549:
548:
547:
546:
541:
538:
535:
530:
527:
524:
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494:
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445:
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437:
434:
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384:
381:
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375:
370:
367:
364:
359:
356:
353:
347:
344:
281:
279:
278:
273:
270:
268:
264:
258:
254:
248:
200:electric current
132:
124:
31:
19:
18:
1337:
1336:
1330:
1329:
1328:
1326:
1325:
1324:
1305:
1304:
1303:
1298:
1280:
1261:Metric prefixes
1244:
1166:
1048:
1041:
993:
988:
958:
957:
948:
946:
938:
932:
928:
911:
910:
906:
897:
895:
884:
880:
871:
869:
856:Rowlett, Russ.
854:
850:
845:
833:
813:
793:
774:
767:
760:
753:
746:
739:
732:
725:
718:
711:
704:
697:
693:
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662:
658:
655:
643:
638:
633:
632:
626:
611:
606:
605:
602:
587:
582:
577:
576:
573:
558:
542:
537:
536:
531:
526:
525:
522:
510:
505:
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498:
486:
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467:
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457:
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429:
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309:The henry is a
260:
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226:
223:
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192:
184:Michael Faraday
130:
122:
50:
41:wound around a
37:composed of an
17:
12:
11:
5:
1335:
1334:
1323:
1322:
1317:
1300:
1299:
1297:
1296:
1285:
1282:
1281:
1279:
1278:
1273:
1268:
1263:
1258:
1252:
1250:
1246:
1245:
1243:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1207:
1202:
1197:
1192:
1187:
1182:
1176:
1174:
1168:
1167:
1165:
1164:
1159:
1154:
1149:
1144:
1139:
1134:
1129:
1124:
1119:
1114:
1109:
1104:
1099:
1094:
1089:
1084:
1079:
1074:
1069:
1067:degree Celsius
1064:
1059:
1053:
1051:
1047:Derived units
1043:
1042:
1040:
1039:
1034:
1029:
1024:
1019:
1014:
1009:
1003:
1001:
995:
994:
987:
986:
979:
972:
964:
956:
955:
926:
904:
878:
847:
846:
844:
841:
840:
839:
832:
829:
812:
809:
792:
789:
690:
689:
665:
661:
654:
641:
631:
625:
614:
601:
585:
572:
557:
545:
534:
521:
513:
497:
489:
476:
465:
452:
444:
427:
414:
405:
394:
388:
374:
363:
350:
284:
283:
267:
263:
257:
253:
246:
243:
240:
237:
234:
231:
210:results in an
191:
188:
150:
149:
128:
119:
118:
115:
114:
109:
102:
101:
97:
96:
91:
87:
86:
83:
79:
78:
73:
69:
68:
63:
57:
56:
52:
51:
47:magnetic field
32:
24:
23:
15:
9:
6:
4:
3:
2:
1333:
1332:
1321:
1318:
1316:
1313:
1312:
1310:
1295:
1287:
1286:
1283:
1277:
1274:
1272:
1269:
1267:
1264:
1262:
1259:
1257:
1254:
1253:
1251:
1247:
1241:
1238:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1216:
1213:
1211:
1208:
1206:
1203:
1201:
1200:degree of arc
1198:
1196:
1193:
1191:
1188:
1186:
1183:
1181:
1178:
1177:
1175:
1173:
1169:
1163:
1160:
1158:
1155:
1153:
1150:
1148:
1145:
1143:
1140:
1138:
1135:
1133:
1130:
1128:
1125:
1123:
1120:
1118:
1115:
1113:
1110:
1108:
1105:
1103:
1100:
1098:
1095:
1093:
1090:
1088:
1085:
1083:
1080:
1078:
1075:
1073:
1070:
1068:
1065:
1063:
1060:
1058:
1055:
1054:
1052:
1050:
1044:
1038:
1035:
1033:
1030:
1028:
1025:
1023:
1020:
1018:
1015:
1013:
1010:
1008:
1005:
1004:
1002:
1000:
996:
992:
985:
980:
978:
973:
971:
966:
965:
962:
944:
937:
930:
922:
918:
914:
908:
894:on 2011-08-12
893:
889:
882:
868:on 2016-08-29
867:
863:
859:
852:
848:
838:
835:
834:
828:
826:
822:
818:
808:
806:
802:
797:
788:
787:
783:
778:
771:
764:
757:
750:
743:
736:
729:
722:
715:
708:
701:
663:
652:
639:
623:
612:
599:
583:
570:
555:
543:
532:
519:
511:
495:
487:
474:
463:
450:
442:
425:
412:
403:
392:
386:
372:
361:
348:
336:
335:
334:
332:
328:
324:
320:
316:
312:
307:
305:
301:
297:
293:
289:
265:
255:
244:
241:
235:
229:
221:
220:
219:
217:
213:
209:
205:
201:
197:
187:
185:
181:
177:
173:
169:
165:
161:
157:
148:
144:
140:
136:
129:
127:
126:SI base units
120:
116:
113:
110:
108:
104:
103:
98:
95:
92:
88:
84:
80:
77:
74:
70:
67:
64:
62:
58:
53:
48:
44:
43:magnetic core
40:
39:enameled wire
36:
30:
25:
20:
1205:electronvolt
1081:
947:. Retrieved
945:. p. 31
929:
916:
907:
896:. Retrieved
892:the original
881:
870:. Retrieved
866:the original
851:
817:permeability
814:
811:Applications
804:
798:
794:
691:
311:derived unit
308:
303:
299:
295:
291:
287:
285:
193:
180:Joseph Henry
159:
155:
153:
111:
106:
94:Joseph Henry
72:Unit of
90:Named after
61:Unit system
1309:Categories
999:Base units
949:2024-01-22
898:2011-08-29
872:2011-08-29
843:References
196:inductance
190:Definition
76:inductance
1142:steradian
1057:becquerel
694:H = henry
664:⋅
660:Ω
640:⋅
630:Ω
584:⋅
533:⋅
464:⋅
426:⋅
393:⋅
362:⋅
329:(s), and
158:(symbol:
105:1 H
1294:Category
1249:See also
1022:kilogram
991:SI units
837:Inductor
831:See also
825:solenoid
821:Formulae
784:, rad =
700:kilogram
319:kilogram
35:inductor
1210:hectare
1195:decibel
1137:sievert
1132:siemens
1062:coulomb
1012:candela
805:henries
780:, Hz =
735:coulomb
692:where:
214:of one
166:in the
1225:minute
1185:dalton
1127:radian
1122:pascal
1112:newton
1037:second
1017:kelvin
1007:ampere
786:radian
728:newton
721:ampere
714:second
331:ampere
327:second
321:(kg),
286:where
208:second
204:ampere
172:ampere
107:in ...
82:Symbol
1240:tonne
1235:neper
1220:litre
1162:weber
1147:tesla
1102:lumen
1097:katal
1092:joule
1087:hertz
1082:henry
1072:farad
1027:metre
939:(PDF)
782:hertz
770:farad
756:weber
754:Wb =
749:tesla
742:joule
707:metre
698:kg =
325:(m),
323:metre
176:weber
156:henry
22:Henry
1215:hour
1157:watt
1152:volt
1077:gray
1032:mole
775:Ω =
768:F =
763:volt
761:V =
747:T =
740:J =
733:C =
726:N =
719:A =
712:s =
705:m =
216:volt
206:per
194:The
154:The
1190:day
1117:ohm
1107:lux
791:Use
777:ohm
674:rad
635:rad
33:An
1311::
919:.
915:.
860:.
807:.
773:,
766:,
759:,
752:,
745:,
738:,
731:,
724:,
717:,
710:,
703:,
696:,
645:Hz
562:Wb
459:kg
357:kg
317::
135:kg
133:1
66:SI
983:e
976:t
969:v
952:.
901:.
875:.
669:s
653:=
624:=
618:F
613:2
608:s
600:=
594:A
589:s
579:V
571:=
565:A
556:=
550:A
544:2
539:m
528:T
520:=
512:2
507:A
502:J
496:=
488:2
483:C
475:2
470:m
451:=
443:2
438:A
431:m
421:N
413:=
404:2
399:A
387:2
382:s
373:2
368:m
349:=
345:H
304:L
300:t
298:(
296:I
292:t
290:(
288:V
282:,
266:t
262:d
256:I
252:d
245:L
242:=
239:)
236:t
233:(
230:V
160:H
147:A
145:⋅
143:s
141:⋅
139:m
137:⋅
85:H
49:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
