Yog lawv hloov pauv, yuav muaj qhov tsis zoo. Yog tias cov ncej ntawm koj lub voltmeter txuas raug raug, nws muaj peev xwm ua rau lub roj teeb raug kev txom nyem ib qho tshwm sim hu ua "polarity reversal". Qhov no yog qhov tshwm sim tsis tshua muaj tshwm sim thaum kawg ntawm kev tso tawm nrog 2 lossis ntau lub roj teeb hauv koob.
Dab tsi yog qhov tsis zoo ntawm qhov ntsuas qhov ntsuas?
Ib qhov tsis zoo yog tus txheeb ze tshaj ntawm electrons piv rau lwm qhov taw tes. Yog tias 0 V tsis muaj hluav taws xob. Qhov hluav taws xob tsis zoo yog qhov dhau ntawm cov hluav taws xob thiab qhov hluav taws xob zoo yog qhov tsis muaj hluav taws xob.
Vim li cas multimeter qhia tsis zoo tam sim no?
Yog tias koj siv lub tam sim no hla lub resistor uas ua rau muaj qhov hluav taws xob ntawm qhov tsis sib xws, koj tuaj yeem pom qhov tsis zoo. Cov kev tiv thaiv siab dua siv qhov qis dua tam sim no, los tsim cov voltage. Qhov no txhais tau tias lawv muaj kev cuam tshuam ntau dua.
txhais li cas yog tias qhov hluav taws xob tsis zoo?
Note: Qhov voltage polarity qhia nyob rau hauv Circuit Court schematics tsuas yog muab ib tug kos npe rau convention los txhais cov voltages. Nws qhia qhov polarity txuam nrog qhov zoo voltage. Yog tias qhov hluav taws xob tsis zoo, lub polarity tsuas yog thim rov qab. Yog li ntawd, yog tias peb rov txhais qhov polarity ntawm qhov sib txawv voltage ntawm daim duab.
Vim li cas peb thiaj xav tau qhov tsis zoo?
Muaj feem yuav ua rau xob quaj tuaj yeem ua rau muaj qhov zoo ntawm cov khoom sivCircuit Court. Txij li thaum tsis muaj hluav taws xob tsis zoo muaj qhov tsis muaj hluav taws xob, nws tuaj yeem cuam tshuam cov nqi zoo uas tuaj yeem zam kev ua kom sov.
