Kev Tshawb Xyuas Ntsej Muag Kom Rov Tsw Hnyav

- Jul 29, 2019-

RESISTIVITY YOG DAB TSI?

Kev thev naus laus zis yog qhov ntsuas ntawm qhov thev tawm ntawm "ntau ntau" ntawm cov khoom siv.

Txhawm rau ntsuas qhov thev taus ntawm cov ntaub ntawv, geometry ntawm cov electrodes siv los ua qhov ntsuas yog suav nrog kev sib npaug. Lub hauv paus kev sib npaug rau kev tiv taus yog

raws ohms kev cai lij choj.

OHMS LAWJ:

Ohms kev cai lij choj: E = Kuv x R

Qhov twg: E = Qhov cub ntawm volts

I = Tam sim no hauv amperes

R = Rho tawm hauv ohms

GEOMETRIC FACTOR:

Thaum ntsuas qhov ntau ntawm cov khoom hauv ntiaj teb tau, qhov thev tawm nws txawv raws qhov ntev ntawm cov khoom. Ib qho tas li yog muab raws li cov kev ntsuas (ntim)

ntawm cov khoom siv nrog nrog hauv qhov ntsuas. Thaum voltage siv rau cov khoom siv, qhov tam sim no yuav ntws los ntawm cov khoom siv sib npaug rau qhov voltage thov thiab rov ua dua

sib piv rau cov tsis kam mus rau qhov ntws tswj los ntawm cov khoom uas muaj thaj chaw (A), thiab qhov ntev (L) nruab nrab ntawm lossis qhov nrug ntawm cov hluav taws xob.

Qhov ntsuas ntawm Cheeb Tsam / Qhov Ntev = meter2 / 'meter'

lossis…

Thaj tsam / Qhov ntev = feet2 / feet = taw

Kev suav ntawm qhov ntsuas tas mus qhov txawv thaum ib "tag nrho lub ntiaj teb" nyob ib puag ncig cov hluav taws xob, zoo li nyob hauv ib lub cev, qhov kev xam yog ua raws li hauv qab no:

G = 4 x pi x L

Qhov Twg:

G = geometric tsis tu ncua (tsis muaj units)

L = nrug ntawm ntsuas cov hluav taws xob hauv qhov ntsuas tsis zoo electrode.

Pi = 3.14 (kwv yees)

Daim duab qhia: Tus qauv thev naus laus zis.

Rov Kho Txoj Cai ohms, R = E / Kuv

Qhov Twg:

R = tiv (ohms)

E = qhov hluav taws xob

I = nimno

Xws li cov duab geometric tsis tu ncua (G) los suav kev qhov tawm tsam,

Kev tawm tsam (p) = G x E / I

Qhov Twg:

p = kev tawm tsam (ohm-meters lossis ohm-taw)

E = qhov hluav taws xob

I = nimno