Cov Lus Qhia Txog Physics Yooj Yim

Tsab xov xwm hais txog Resistivity

Hais txog qhov hluav taws xob tam sim no, qhov ceev ntawm qhov hluav taws xob tam sim no tau tham txog lawm, yog li ntawd kuj tau piav qhia txog lub zog hluav taws xob hauv lub ncauj lus txog lub zog hluav taws xob. Lub zog hluav taws xob thiab lub zog hluav taws xob nyob hauv tus neeg coj hluav taws xob yog tias muaj qhov sib txawv ntawm lub zog hauv tus neeg coj hluav taws xob, thaum yog tias tsis muaj qhov sib txawv ntawm lub zog, ces kuj tsis muaj lub zog hluav taws xob thiab lub zog hluav taws xob.

Hauv yuav luag txhua tus hlau conductors, lub teb hluav taws xob yog ncaj qha proportional rau qhov ceev ntawm lub hluav taws xob tam sim no, qhov twg qhov piv ntawm lub teb hluav taws xob rau qhov ceev ntawm lub hluav taws xob tam sim no yog tas li. Tus nqi ntawm kev sib piv ntawm lub teb hluav taws xob rau qhov ceev tam sim no hu ua resistivity. Mathematically, kev sib raug zoo ntawm lub teb hluav taws xob, qhov ceev tam sim no, thiab resistivity yog hais nyob rau hauv equation:

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Article about the Resistor color code

cov resistor is one component of an electrical circuit that functions to control the number of electric currents. In general, there are two types of resistors, namely wire coil resistors and carbon resistors. Wire roll resistors are usually used in the laboratory, made by wrapping fine wire on the surface of the insulator tube. Carbon resistors are typically used in electronic circuits, cylindrical, and have wires at both ends. The value of the carbon resistor resistance is expressed in color code and displayed on the surface of the resistor.

The resistance value of a resistor can be known by interpreting the resistor color code. To understand this, first look at the following table, then study the example problem to determine the resistor resistance value.

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Article about the Resistors in series

If the resistors are connected as shown in the figure, the resistors are arranged in series. Resistor or electrical resistance in question can be in the form of resistor components, lights, or other electrical resistance.

The electric charge moves through resistance 1 (R₁) = ua hluav taws xob moves through resistance 2 (R₂) = the electric charge moves through resistance 3 (R₃). Hluav taws xob tam sim no (I) is an electric charge that flows during a certain time interval (I = Q / t), hence the electric current through resistance 1 (I₁) = electric current through resistance 2 (I₂) = electric current through resistance 3 (I₃). Mathematically, the total electric current (I) = I₁ = Kuv₂ = Kuv₃.

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Kev sib npaug ntawm kev tiv thaiv hluav taws xob

Hauv zaj lus qhia txog Ohm txoj cai, ib daim ntawv qhia txog kev sib raug zoo ntawm cov voltage (V), fais fab tam sim no (Kuv), thiab hluav taws xob tsis kam (R) tau muab los. Kev suav lej los ntawm cov qauv:

Cov kab zauv no qhia tau hais tias qhov hluav taws xob tsis kam (R) yog sib npaug ncaj qha rau qhov hluav taws xob hluav taws xob (V) thiab sib npaug rau qhov hluav taws xob tam sim no (I). Yog tias qhov hluav taws xob loj dua qhov hluav taws xob tsis kam loj dua, ntawm qhov tsis sib xws, yog tias qhov hluav taws xob muaj zog dua qhov hluav taws xob tsis kam loj dua. Cov kab zauv no piav qhia txog Ohm txoj cai tsuas yog thaum qhov hluav taws xob tsis kam (R) tas li. Yog tias qhov hluav taws xob tsis kam tsis tas li, ces cov kab zauv no tsis piav qhia txog Ohm txoj cai, tab sis piav qhia txog qhov tsis kam ntawm tus neeg coj hluav taws xob.

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Article about the Resistors in parallel

If the resistors are connected as in the figure, the resistors are connected in parallel.

cov fais fab tam sim no (electric current = electric charge that flows during a time interval) that enters the junction point is the same as the electric current exit from the junction point. There are several junctions so that the total electric current = the amount of electric current flowing in each junction. Mathematically, I = I₁ + Kuv₂ + Kuv₃. While the electric potential difference or hluav taws xob voltage in each junction is the same.

I = V/R so the above equation changes to I = V/R₁ + V/R₂ + V/R₃. The electric voltage is equal, so this equation changes to I = V (1/R₁ + 1/R₂ + 1/R₃). If the equivalent resistance is 1/R then I = V (1/R). Thus, 1/R = 1/R₁ + 1/R₂ + 1/R₃.

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Tsab xov xwm hais txog Qhov chaw ntawm electromotive force emf Internal resistance Terminal voltage

Hluav taws xob tam sim no ntws hauv lub voj voog kaw, los ntawm lub zog siab mus rau lub zog qis. Thaum lub zog hluav taws xob txav mus los ntawm ib feem ntawm kev tiv thaiv hluav taws xob, muaj kev txo qis hauv lub zog hluav taws xob vim tias lub zog hluav taws xob siv rau qhov kev tiv thaiv no. Yuav kom cov hluav taws xob txuas ntxiv mus los ntawm lub zog siab mus rau lub zog qis,

Yuav tsum muaj ib lub cuab yeej los ntxiv lub zog hluav taws xob, lub cuab yeej yog lub zog electromotive (emf) lossis qhov tseeb dua hu ua qhov chaw hluav taws xob. Emf lossis qhov chaw hluav taws xob yog ib qho khoom siv uas hloov ib hom zog mus rau hauv lub zog hluav taws xob, xws li roj teeb, lub hnub ci hlwb, lossis cov tshuab hluav taws xob.

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EMFs nyob rau hauv series thiab parallel

Yog tias muaj ob lossis ntau qhov chaw ntawm electromotive (emf) txuas nrog raws li pom hauv daim duab, emf raug teeb tsa ua series.

Qhov sib npaug voltage qhov chaw (ε) yog:

ε = ε₁ + ε₂ + ε_n

Qhov sib npaug sab hauv tsis kam (r) yog:

r = r₁ +r₂ +r_n

Lub zog hluav taws xob ntws los ntawm sab nraud tsis kam (R) yog:

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Txoj cai thawj zaug ntawm Kirchhoff, uas tseem hu ua txoj cai ntawm qhov chaw sib tshuam, hais tias cov hluav taws xob uas nkag mus rau hauv qhov chaw sib tshuam yog tib yam li cov hluav taws xob tawm ntawm qhov chaw sib tshuam ntawd. Qhov chaw sib tshuam hauv lub voj voog hluav taws xob yog qhov chaw uas ob lossis ntau dua ntawm ob lub xov hlau sib ntsib, xws li qhov chaw a hauv daim duab ntawm sab.

Kuv yog lub zog hluav taws xob uas nkag mus rau qhov chaw sib tshuam, thaum kuv₁ thiab kuv₂ yog cov hluav taws xob uas tawm ntawm qhov chaw sib tshuam, Kuv = Kuv₁ + Kuv₂. Lwm qhov piv txwv, saib daim duab hauv qab no.

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Txoj cai thib ob ntawm Kirchhoff hais tias qhov kev hloov pauv ntawm lub zog hluav taws xob ntawm qhov ncig ntawm lub voj voog kaw yog xoom. Txoj cai thib ob ntawm Kirchhoff yog raws li txoj cai ntawm kev txuag lub zog, uas hais tias lub zog yog nyob mus ib txhis.

Yuav kom nkag siab zoo dua qhov no, xav txog lub zog hluav taws xob txav mus rau hauv lub voj voog kaw, zoo li hauv daim duab. Thaum lub zog hluav taws xob hla dhau ib qho hluav taws xob tsis kam (R), tus lub zog hluav taws xob raug txo vim nws siv rau cov kev tiv thaiv no. Yog tias lub zog hluav taws xob hla dhau lwm qhov kev tiv thaiv hluav taws xob, lub zog hluav taws xob muaj peev xwm txo qis dua vim nws siv dua rau ntawm qhov tsis kam. Ntxiv mus, thaum lub zog hluav taws xob hla dhau qhov chaw hluav taws xob los ntawm qhov muaj peev xwm qis mus rau qhov muaj peev xwm siab, lub zog hluav taws xob muaj peev xwm nce ntxiv. Thaum nws rov qab mus rau nws qhov chaw qub, lub zog hluav taws xob muaj peev xwm zoo ib yam li yav dhau los, qhov twg qhov kev hloov pauv ntawm lub zog hluav taws xob muaj peev xwm yog xoom. Thaum thov KirchhoffTxoj cai thib ob rau lub voj voog hluav taws xob, peb siv qhov kev hloov pauv ntawm qhov hluav taws xob, tsis yog qhov kev hloov pauv ntawm lub zog hluav taws xob.

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Kev txhais ntawm lub zog hluav taws xob

Lub zog uas kawm tau hauv txoj haujlwm thiab Lub Zog yog txiav txim siab ua txoj haujlwm ua tiav thaum lub sijhawm tshwj xeeb. Kev ua haujlwm yog ib qho txheej txheem ntawm kev hloov pauv lub zog kom lub zog tuaj yeem nkag siab tias yog kev hloov pauv ntawm lub zog uas tshwm sim thaum lub sijhawm tshwj xeeb.

Lub zog hluav taws xob yog kev hloov pauv ntawm lub zog hluav taws xob thaum lub sijhawm tshwj xeeb. Hauv kev tshuaj xyuas txog lub zog hluav taws xob, nws piav qhia tias kev hloov pauv ntawm lub zog hluav taws xob tshwm sim thaum lub zog hluav taws xob hla dhau ib cheeb tsam lub zog hluav taws xob qhov txawv.

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