Multimeter - Cov cim rau AC thiab DC yog dab tsi,
Lub cim rau alternating tam sim no yog "~", lossis AC luv luv;
Lub cim rau tam sim no yog "-", lossis DC luv luv.
Piv txwv li, AC voltage yog AC220V, thiab DC voltage yog DC24V.
Qhov loj thiab kev taw qhia ntawm qhov tam sim no ntawm kev hloov tam sim no yog qhov tam sim no sib txawv ntawm lub sijhawm mus rau lub sijhawm, thiab qhov nruab nrab tus nqi ntawm nws txoj haujlwm hauv ib lub voj voog yog xoom.
DC tam sim no, tseem hu ua qhov tam sim no tsis tu ncua, yog qhov loj thiab kev taw qhia. Qhov ceev tam sim no sib txawv nrog lub sijhawm, feem ntau txav mus rau tib qho kev taw qhia txhua lub sijhawm.
Alternating Current (Alternating Current, abbreviation: AC) yog alternating tam sim no uas nws cov kev taw qhia hloov ib ntus mus rau lub sij hawm, nrog ib tug khiav nruab nrab ntawm xoom nyob rau hauv ib lub voj voog. Tsis zoo li tam sim no ncaj qha, nws cov kev taw qhia hloov lub sij hawm, thiab ncaj qha tam sim no tsis muaj kev hloov pauv.
"Direct Current (DC), tseem hu ua "tam sim no tsis tu ncua", yog hom tam sim no ncaj qha, qhov ncaj qha tam sim no uas nws qhov loj thiab kev taw qhia tsis hloov pauv, thiab tau tshawb pom los ntawm Thomas Edison hauv 1747. Xyoo 1747, American Franklin tsim txoj cai. kev txuag hluav taws xob raws li kev sim thiab txhais cov ntsiab lus zoo thiab tsis zoo hluav taws xob.
Qhov zaus ntawm alternating tam sim no (AC) yog tus naj npawb ntawm lub sij hawm nws txawv ib ntus ib chav tsev ntawm lub sij hawm nyob rau hauv hertz, uas yog inversely cuam tshuam rau lub sij hawm. Qhov zaus ntawm kev hloov pauv tam sim no (AC) hauv lub neej niaj hnub feem ntau yog 50 Hz lossis 60 Hz, qhov zaus ntawm AC koom nrog hauv xov tooj cua tshuab feem ntau loj dua, ncav cuag kilohertz (KHz) lossis txawm megahertz (MHz) ntsuas.
AC zaus ntawm lub zog hluav taws xob sib txawv ntawm lub teb chaws mus rau ib lub teb chaws, thiab feem ntau yog 50 Hz lossis 60 Hz. Nyob rau hauv Asia, 50 Hz yog siv nyob rau hauv Tuam Tshoj, Nyiv, Thaib teb, Is Nrias teb thiab Singapore, thaum 60 Hz yog siv nyob rau hauv South Kauslim, lub Philippines thiab Taiwan, 50 Hz yog siv nyob rau hauv feem ntau ntawm cov teb chaws Europe, thiab 60 Hz yog siv nyob rau hauv Americas, Feem ntau hauv Mexico, Tebchaws Asmeskas thiab Canada.
