Voltmeter vs Ammeter
Voltmeters thiab ammeters yog cov cuab yeej siv dav hauv kev ua haujlwm ntawm physics, hluav taws xob engineering, thiab hluav taws xob engineering. Ob lub ammeter thiab voltmeter yog siv los ntsuas cov khoom ntawm hluav taws xob thiab hluav taws xob circuits. Cov cuab yeej no feem ntau yog raws li tus neeg xyuas pib coil muab tso rau hauv qhov chaw sib nqus muaj zog, tab sis lwm yam khoom siv xws li cov voltmeters thiab ammeters, multimeters, potentiometers, tam sim no tshuav nyiaj li cas, thiab electrostatic voltmeters kuj muaj.
Voltmeter
Chav tsev "Volt" yog lub npe hu ua Alessandro Volta. Nws yog siv los ntsuas qhov peev xwm ntawm qhov taw tes lossis qhov sib txawv ntawm ob lub ntsiab lus. Feem ntau cov voltmeter yog qhov txawv ntawm galvanometer. Ib tug siab heev resistor teem nyob rau hauv series nrog lub galvanometer ua rau lub hauv paus voltmeter. Voltmeters muaj qhov sib txawv ntawm ob peb microvolts mus txog ob peb Gigavolts. Raws li tau piav qhia ua ntej, qhov yooj yim voltmeter muaj ib qho tam sim no nqa coil tso rau hauv ib qho chaw sib nqus sab nraud. Lub magnetic teb vim yog tam sim no nqa coil repulses cov hlau nplaum mus tas li. Cov nyhuv no ua rau qhov taw qhia txuas rau lub kauj kom tig; qhov taw qhia kauj qhov system yog caij nplooj ntoos hlav loaded, yog li coj qhov taw qhia rov qab mus rau xoom pointer thaum tsis muaj tam sim no. Lub kaum sab xis ntawm qhov taw qhia tig yog proportional rau tam sim no tam sim no nyob rau hauv lub kauj. Cov voltmeter digital siv ib qho analog rau digital conversion (ADC) los hloov qhov tam sim no voltage rau tus nqi digital. Tab sis cov teeb liab tuaj yuav tsum tau ua kom nrov lossis txo qis nyob ntawm qhov ntsuas qhov ntsuas tau siv hauv qhov ntsuas ua ntej nws tuaj yeem tso tawm raws li tus nqi digital. Qhov teeb meem tseem ceeb uas cuam tshuam nrog voltmeters yog tias, lawv muaj tus nqi tsis txaus siab; Qhov zoo tshaj plaws, lub voltmeter yuav tsum muaj infinite impedance, uas txhais tau tias nws yuav tsum tsis txhob kos ib qho tam sim no los ntawm Circuit Court. Txawm li cas los xij, qhov no tsis yog qhov tseeb nrog voltmeters tiag. Ib tug tiag tiag voltmeter yuav tsum tau kos ib tug tam sim no los ntawm lub Circuit Court nyob rau hauv thiaj li yuav tsim lub repulsive magnetic teb. Txawm li cas los xij, qhov no tuaj yeem txo qis los ntawm kev siv amplifiers kom qhov cuam tshuam rau lub voj voog tsawg tsawg.
Ammeter
Ammeter kuj yog qhov hloov pauv ntawm galvanometer. Nws siv lub galvanometer lub hauv paus ntsiab lus ntawm kev qhia txog qhov hloov pauv tam sim no. Tam sim no ntsuas hauv amperes (A). Yog li, ammeters, uas ntsuas hauv milliamperes hu ua milliammeter, thiab microampere ranged ammeter hu ua microammeter. Qhov zoo tshaj plaws, ammeter yuav tsum muaj pes tsawg tus nqi tsis kam, tab sis cov ntaub ntawv nrog xoom resistivity tsis tuaj. Yog li ntawd, txhua lub ammeter muaj qhov yuam kev inbuilt. Muaj qhov tseeb ammeters, xws li: tam sim no tshuav nyiaj li cas. Lub ammeter kuj tuaj nyob rau hauv cov ntaub ntawv ntawm tsiv hlau ammeters, kub hlau ammeters, thiab digital ammeters.
Qhov txawv ntawm Voltmeter thiab Ammeter
– Basic ammeters thiab voltmeters yog galvanometers. Lub voltmeter tuaj yeem npaj tau los ntawm kev teeb tsa qhov tsim nyog resistor hauv koob nrog galvanometer.
– Qhov zoo tshaj plaws, ammeters yuav tsum muaj xoom tsis kam, thiab voltmeters yuav tsum muaj qhov tsis muaj kev tiv thaiv.
– Ib qho ammeter zoo tagnrho yuav tsum tsis txhob muaj qhov hluav taws xob poob thoob plaws lub davhlau ya nyob twg, thiab qhov zoo tshaj plaws voltmeter yuav tsum tsis muaj tam sim no mus dhau nws.
