Ana amfani da ƙarfe mai amfani da ƙarfe mai amfani da ƙarfin juriya wajen dumama ƙarfe mai amfani da ƙarfin lantarki, da kuma sauran na'urorin lantarki masu amfani da ƙarfin lantarki mai .... Za mu iya samar da dukkan nau'ikan na'urorin waya masu zagaye, masu faɗi da kuma na takarda.
CuNi34wani nau'in ƙarfe ne mai ƙarancin juriya (dumama). Yana ɗaya daga cikin mahimman kayan samfuran lantarki masu ƙarancin ƙarfin lantarki. Ana amfani da shi sosai a cikin na'urar fashewa mai ƙarancin ƙarfin lantarki, barguna na lantarki, relay mai yawa na zafi da sauran samfuran lantarki masu ƙarancin ƙarfin lantarki.
Jerin ƙarfe na nickel: Constantan CuNi40 (6J40), CuNi1, CuNi2, CuNi6, CuNi8, CuNi10, CuNi14, CuNi19, CuNi23, CuNi30, CuNi34, CuNi44.
Babban maki da kaddarorin
| Nau'i | juriyar lantarki (20 digiriΩ) mm²/m) | ma'aunin juriya na zafin jiki (10^6/digiri) | Dazuzzuka ity g/mm² | Matsakaicin zafin jiki (°c) | Wurin narkewa (°c) |
| CuNi1 | 0.03 | <1000 | 8.9 | / | 1085 |
| CuNi2 | 0.05 | <1200 | 8.9 | 200 | 1090 |
| CuNi6 | 0.10 | <600 | 8.9 | 220 | 1095 |
| CuNi8 | 0.12 | <570 | 8.9 | 250 | 1097 |
| CuNi10 | 0.15 | <500 | 8.9 | 250 | 1100 |
| CuNi14 | 0.20 | <380 | 8.9 | 300 | 1115 |
| CuNi19 | 0.25 | <250 | 8.9 | 300 | 1135 |
| CuNi23 | 0.30 | <160 | 8.9 | 300 | 1150 |
| CuNi30 | 0.35 | <100 | 8.9 | 350 | 1170 |
| CuNi34 | 0.40 | -0 | 8.9 | 350 | 1180 |
| CuNi40 | 0.48 | ±40 | 8.9 | 400 | 1280 |
| CuNi44 | 0.49 | <-6 | 8.9 | 400 | 1280 |
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