Constantan alloy Nws resistivity (4.9 x 10− 7 Ω·m) yog siab txaus kom ua tau raws li qhov tsim nyog kuj muaj nuj nqis nyob rau hauv txawm me me daim phiaj, thiab nws kub coefficient ntawm tsis kam yog haum tsawg. Tsis tas li ntawd, constantan yog tus cwj pwm los ntawm lub neej qaug zog zoo thiab muaj peev xwm elongation siab.
Dab tsi yog qhov kev tiv thaiv ntawm tus xaim SWG 28?
Lub 1.10 m ntev ntawm cov xaim tsis tu ncua ntawm 28 swg (0.38 mm txoj kab uas hla) yuav tsum muab qhov kwv yees tsis kam ntawm 5 Ω. Yog tias tsis muaj cov xaim tsis tu ncua, ces 28 swg (0.38 hli txoj kab uas hla) nichrome hlau yuav raug siv los ua lwm txoj hauv kev.
Dab tsi yog qhov kev tiv thaiv ntawm cov hlau?
Resistivity, feem ntau cim los ntawm Greek tsab ntawv rho, ρ, yog ntau npaum li cas sib npaug R ntawm cov qauv xws li ib tug hlau, muab faib los ntawm nws tus ntoo khaub lig-sectional cheeb tsam A, thiab muab faib los ntawm nws ntev l; ρ=RA/l. Chav tsev ntawm qhov tsis kam yog ohm.
Dab tsi yog qhov kev tiv thaiv ntawm manganin?
Manganin (84% Cu, 4% Ni. 12% Mn) Qhov no tau ua cov khoom siv rau qib siab tus qauv resistors. Nws cov resistivity yog txog 0.40 μΩ-m thiab nws qhov kub thiab txias yog li 1 × 10 - 5 / °C.
Yuav ua li cas hauv qab no muaj kev tiv thaiv siab tshaj?
Qhov twg hauv qab no muaj kev tiv thaiv siab tshaj?
- Mica.
- Air.
- Mineral oil.
Paraffin Yees
