Tinee9: Resistors hauv Series: 5 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:29

Qib Qhia: Qib Kawm.

Kev tsis lees paub: Thov kom niam txiv/tus saib xyuas saib yog koj yog menyuam yaus vim tias koj tuaj yeem ua rau hluav taws yog tias koj tsis ceev faj.

Kev tsim hluav taws xob rov qab mus rau lub xov tooj, teeb pom kev zoo, siv hluav taws xob hauv AC lossis DC, thiab lwm yam. Hauv txhua yam khoom siv hluav taws xob koj khiav mus rau 3 yam khoom tseem ceeb: Resistor, Capacitor, Inductor.

Hnub no nrog Tinee9 peb yuav kawm paub txog cov neeg tawm tsam. Peb yuav tsis kawm xim xim rau cov neeg tawm tsam vim tias muaj ob lub pob khoom: Thruhole thiab SMD resistor uas txhua tus muaj nws tus kheej lossis tsis muaj tus lej.

Thov mus saib Tinee9.com rau lwm cov kev qhia thiab cov txuj ci txias.

Kauj ruam 1: Cov ntaub ntawv

Cov ntaub ntawv:

Nscope

Cov khoom sib txawv

Khoos phis tawj (uas tuaj yeem txuas rau Nscope)

LTSpice (software

Hauv qab no yog qhov txuas rau Nscope thiab Resistor Assortment:

Khoom

Kauj ruam 2: Resistors

Cov neeg tiv taus yog zoo li cov kav dej uas tso dej ntws los. Tab sis qhov sib txawv ntawm cov yeeb nkab tso cai sib txawv ntawm cov dej ntws los ntawm nws. Piv txwv li cov yeeb nkab loj 10 nti yuav tso dej kom ntws ntau dua li 1 nti yeeb nkab. Tib yam nrog tus tiv thaiv, tab sis rov qab. Yog tias koj muaj tus nqi tiv thaiv loj, cov hluav taws xob tsawg yuav muaj peev xwm ntws los ntawm. Yog tias koj muaj tus nqi tiv thaiv me me ces koj yuav muaj ntau lub tshuab hluav taws xob ntws los.

Ohms yog chav tsev rau tus tiv thaiv. Yog tias koj xav kawm keeb kwm ntawm qhov ua li cas ohm dhau los ua chav nyob uas muaj npe tom qab kws kho mob German Georg Simon Ohm mus rau hauv wiki no

Kuv yuav sim thiab ua qhov yooj yim no.

Ohm Txoj Cai yog txoj cai thoob ntiaj teb uas txhua yam ua raws: V = I*R

V = Voltage (Lub zog muaj peev xwm. Chav yog Volt)

I = Tam sim no (Cov ntsiab lus yooj yim ntawm cov electrons ntws. Chav yog Amps)

R = Kev Tiv Thaiv (Cov yeeb nkab me me tab sis me dua thiab loj dua yog qhov me dua. Yog tias koj paub faib ces cov yeeb nkab loj = 1/x qhov twg x yog tus nqi tsis kam. Chav nyob yog Ohms)

Kauj Ruam 3: Lej: Piv Piv Piv Txwv

Yog li hauv daim duab saum toj no yog tshuaj ntsuam ntawm tus qauv LTspice. LTSpice yog software uas pab cov kws tsim hluav taws xob thiab cov neeg nyiam ua haujlwm tsim lub voj voog ua ntej lawv tsim nws.

Hauv kuv tus qauv, kuv tso qhov Voltage source (ex. Battery) nyob rau sab laug nrog lub + thiab - hauv lub voj voog. Kuv mam li kos kab rau zig zag tshaj plaws (qhov no yog tus tiv thaiv) nrog R1 saum nws. Tom qab ntawd kuv kos lwm kab rau lwm tus tiv nrog R2 saum nws. Kuv kos kab kawg rau lwm sab ntawm qhov hluav taws xob. Thaum kawg, Kuv tau tso ib daim duab peb sab rau ntawm kab hauv qab ntawm daim duab uas sawv cev rau Gnd lossis cov ntsiab lus siv ntawm Circuit Court.

V1 = 4.82 V (Nscope's +5V tsheb nqaj hlau Voltage los ntawm USB)

R1 = 2.7Kohms

R2 = 2.7Kohms

Kuv =? Amps

Qhov kev teeb tsa no hu ua series circuit. Yog li yog tias peb xav paub tam sim no lossis tus naj npawb ntawm cov hluav taws xob ntws hauv Circuit Court peb ntxiv R1 thiab R2 ua ke uas hauv peb qhov piv txwv = 5.4 Kohms

Piv txwv 1

Yog li V = I*R -> I = V/R -> I = V1/(R1+R2) -> I = 4.82/5400 = 0.000892 Amps lossis 892 uAmps (metric system)

Piv txwv 2

Txog kev ncaws peb yuav hloov R1 rau 10 Kohms Tam sim no cov lus teb yuav yog 379 uAmps

Txoj Kev Teb: Kuv = 4.82/(10000+2700) = 4.82/12700 = 379 uAmps

Piv txwv 3

Piv txwv zaum kawg R1 = 0.1 Kohms Tam sim no cov lus teb yuav 1.721 mAmps lossis 1721 uArmps

Txoj Kev Teb: Kuv = 4.82/(100+2700) = 4.82/2800 = 1721 uAmps -> 1.721 mAmps

Vam tias, koj pom tias txij li R1 hauv qhov piv txwv dhau los me me tam sim no lossis amps loj dua li ob qho piv txwv dhau los. Qhov nce hauv tam sim no txhais tau tias muaj ntau lub tshuab hluav taws xob ntws los ntawm lub voj voos Tam sim no peb xav paub seb qhov hluav taws xob yuav nyob ntawm qhov taw tes sojntsuam hauv daim duab saum toj no. Kev sojntsuam tau teeb tsa nruab nrab ntawm R1 thiab R2 …… Peb yuav ua li cas thiaj paub qhov hluav taws xob nyob ntawd ?????

Zoo, Ohms txoj cai hais tias Voltage hauv qhov kaw hluav taws xob yuav tsum = 0 V. Nrog cov lus ntawd yuav ua li cas rau qhov hluav taws xob los ntawm lub roj teeb? Txhua tus resistor tshem tawm qhov hluav taws xob los ntawm qee feem pua. Raws li peb siv tus piv txwv 1 tus nqi hauv piv txwv 4, peb tuaj yeem suav tau tias qhov hluav taws xob ntau npaum li cas raug tshem tawm hauv R1 thiab R2.

Piv txwv 4 V = I * R -> V1 = I * R1 -> V1 = 892 uAmps * 2700 Ohms = 2.4084 Volts V2 = I * R2-> V2 = 892 uA * 2.7 Kohms = 2.4084 V

Peb yuav hloov 2.4084 txog 2.41 Volts

Tam sim no peb paub tias muaj pes tsawg volts raug tshem tawm los ntawm txhua tus tiv thaiv. Peb siv GND sysmbol (Upside down triangle) hais 0 Volts. Dab tsi tshwm sim tam sim no, 4.82 Volts tsim los ntawm roj teeb mus rau R1 thiab R1 siv 2.41 Volts tseg. Lub chaw sojntsuam yuav tam sim no muaj 2.41 Volts uas tom qab ntawd mus rau R2 thiab R2 tshem tawm 2.41 Volts. Gnd tom qab ntawd muaj 0 Volts uas mus rau lub roj teeb uas tom qab ntawd lub roj teeb tsim 4.82 Volts thiab rov ua dua lub voj voog.

Soj ntsuam taw tes = 2.41 Volts

Piv txwv 5 (peb yuav siv qhov txiaj ntsig los ntawm Piv Txwv 2)

V1 = I * R1 = 379 uA * 10000 Ohms = 3.79 Volts

V2 = I * R2 = 379 uA * 2700 Ohms = 1.03 Volts

Soj Ntsuam Point = V - V1 = 4.82 - 3.79 = 1.03 Volts

Ohms Law = V - V1 -V2 = 4.82 - 3.79 - 1.03 = 0 V

Piv txwv 6 (peb yuav siv qhov txiaj ntsig los ntawm Piv Txwv 3)

V1 = I * R1 = 1721 uA * 100 = 0.172 Volts

V2 = I * R2 = 1721 uA * 2700 = 4.65 Volts

Ntsuas qhov ntsuas hluav taws xob = 3.1 Volts

Txoj hauv Kev Teb Cov Lus Soj Ntsuam Point = V - V1 = 4.82 - 0.17 = 4.65 Volts

Soj Ntsuam Point txoj hauv kev sib txawv ntawm kev suav qhov hluav taws xob: Vp = V * (R2)/(R1+R2) -> Vp = 4.82 * 2700/2800 = 4.65 V

Kauj Ruam 4: Piv Lub Neej Tiag

Yog tias koj tsis tau siv Nscope ua ntej thov xa mus rau Nscope.org

Nrog Nscope Kuv tso ib kawg ntawm 2.7Kohm resistor hauv Channel 1 qhov thiab lwm qhov kawg ntawm +5V txoj kab tsheb nqaj hlau. Tom qab ntawd kuv tso tus tiv thaiv thib ob ntawm lwm Channel 1 qhov thiab lwm qhov kawg ntawm GND txoj kab tsheb nqaj hlau. Ceev faj kom tsis txhob muaj qhov tiv thaiv qhov kawg ntawm +5V txoj kev tsheb nqaj hlau thiab GND kev tsheb nqaj hlau kov lossis koj tuaj yeem ua rau koj Nscope lossis ntes qee yam ntawm hluav taws.

Dab tsi tshwm sim thaum koj 'luv' +5V rau GND ntsia ua ke, qhov tsis kam mus rau 0 Ohms

Kuv = V/R = 4.82/0 = infinity (tus lej loj heev)

Kev lig kev cai peb tsis xav kom tam sim no mus txog qhov kawg vim tias cov cuab yeej tsis tuaj yeem ua haujlwm tsis muaj qhov kawg tam sim no thiab zoo li yuav raug hluav taws. Luckily Nscope muaj kev tiv thaiv tam sim no kom cia siab tias yuav tiv thaiv hluav taws lossis puas rau nscope ntaus ntawv.

Kauj Ruam 5: Xeem Lub Neej Tiag Ntawm Piv Txwv 1

Thaum txhua yam teeb tsa, koj Nscope yuav tsum qhia koj tus nqi ntawm 2.41 Volts zoo li thawj daim duab saum toj no. (txhua txoj kab tseem ceeb saum channel 1 tab yog 1 Volts thiab txhua kab me yog 0.2 Volts) Yog tias koj tshem R2, tus tiv thaiv uas txuas Channel 1 mus rau GND kev tsheb nqaj hlau, kab liab yuav nce mus txog 4.82 Volts zoo li hauv daim duab saum toj no.

Hauv daim duab thib ob saum toj no koj tuaj yeem pom LTSpice kev twv ua ntej tau raws li peb qhov kev kwv yees kwv yees uas ua tau raws li peb qhov kev ntsuas lub neej tiag.

Nrog koj zoo siab koj tau tsim koj thawj Circuit Court. Series Resistor kev sib txuas.

Sim tawm lwm qhov txiaj ntsig ntawm Kev Tiv Thaiv zoo li hauv Piv Txwv 2 thiab Piv Txwv 3 kom pom tias koj qhov kev suav suav nrog qhov txiaj ntsig ntawm lub neej tiag. Kuj xyaum lwm qhov txiaj ntsig ib yam nkaus tab sis nco ntsoov tias koj tam sim no tsis tshaj 0.1 Amps = 100 mAmps = 100, 000 uAmps

Thov ua raws kuv ntawm no ntawm cov lus qhia thiab ntawm tinee9.com