# 2 airíonna Tomhsaire Sreangú Meiriceánach (AWG): trastomhas, achar, friotaíocht.
Trastomhas na sreinge # 2 AWG in orlach:
d 2 (orlach) = 0.005 orlach × 92 (36-2) / 39 = 0.2576 orlach
d 2 (mm) = 0.127 mm × 92 (36-2) / 39 = 6.5437 mm
Achar na sreinge # 2 AWG i gcileagraim chiorclach:
A n (kcmil) = 1000 × d n 2 = 1000 × (0.2576 in) 2 = 66.3713 kcmil
Achar na sreinge AWG # 2 in orlach cearnach:
A 2 (orlach 2 ) = (π / 4) × d n 2 = (π / 4) × (0.2576 in) 2 = 0.0521 orlach 2
A 2 (mm 2 ) = (π / 4) × d n 2 = (π / 4) × (6.5437 mm) 2 = 33.6308 mm 2
Ábhar sreinge |
Friotaíocht @ 20ºC (Ω × m) |
Friotaíocht in aghaidh an chileavata @ 20ºC (Ω / kft) |
Friotaíocht in aghaidh an chiliméadair @ 20ºC (Ω / km) |
|---|---|---|---|
| Copar | 1.72 × 10 -8 | 0.1559 | 0.5114 |
| Alúmanam | 2.82 × 10 -8 | 0.2556 | 0.8385 |
| Cruach carbóin | 1.43 × 10 -7 | 1.2960 | 4.2521 |
| Cruach leictreach | 4.60 × 10 -7 | 4.1690 | 13.6779 |
| Óir | 2.44 × 10 -8 | 0.2211 | 0.7255 |
| Nichrome | 1.1 × 10 -6 | 9.9694 | 32.7081 |
| Nicil | 6.99 × 10 -8 | 0.6335 | 2.0784 |
| Airgid | 1.59 × 10 -8 | 0.1441 | 0.4728 |
* D’fhéadfadh torthaí athrú le fíor-sreanga: friotachas difriúil ábhair agus líon na snáitheanna i sreang
Tá an fhriotaíocht sreinge tomhsaire R in ohms in aghaidh an chileavéad (Ω / kft) cothrom le 0.3048 × 1000000000 oiread friotachas na sreinge ρ i ohm-mhéadar (Ω · m) arna roinnt ar 25.4 2 oiread an achair thrasghearrthaigh A n in orlach cearnach ( in 2 ):
R n (Ω / kft) = 0.3048 × 10 9 × ρ (Ω · m) / (25.4 2 × A n (in 2 ) )
Tá friotaíocht na sreinge tomhsaire R in ohms in aghaidh an chiliméadair (Ω / km) cothrom le 1000000000 oiread friotachas na sreinge ρ i méadair ohm (Ω · m) arna roinnt ar an limistéar trasghearrthach A n i milliméadair chearnacha (mm 2 ):
R n (Ω / km) = 10 9 × ρ (Ω · m) / A n (mm 2 )
Advertising