Cov Cai ntawm Kirchhoff - Teeb Meem thiab Kev daws teeb meem
1. Lub zog hluav taws xob kawg ntawm lub roj teeb hauv lub voj voog hauv qab no yog dab tsi?
tshuaj
emf = lub zog hluav taws xob = qhov sib txawv ntawm cov terminals thaum tsis muaj tam sim no ntws mus rau ib qho circuit sab nraud.
Qhov hluav taws xob kawg (V) = qhov sib txawv ntawm cov kawg thaum muaj hluav taws xob ntws los ntawm lub roj teeb.
Yog tias tsis muaj hluav taws xob rub tawm ntawm lub roj teeb, qhov hluav taws xob kawg sib npaug rau emf.
Paub:
Tus tiv thaiv 1 (R 1 ) = 2 Ω
Tus Resistor 2 (R2 ) = 4 Ω
Tus Resistor 3 (R 3 ) = 4 Ω
emf 1 (E 1 ) = 20 Volt
emf2 (E2 ) = 15 Volt
Qhov voltage: Qhov kawg (V)
Kev daws 1:
Qhov hluav taws xob kawg:
V = E 1 – E 2 = 20 – 15 = 5V
Kev daws 2:
Xam cov dej ntws tam sim no hauv lub voj voog (I)
Ua ntej , Xaiv qhov kev taw qhia ntawm txhua qhov tam sim no. Qhov kev taw qhia tuaj yeem xaiv tau yam tsis muaj kev txwv: yog tias qhov tam sim no yeej nyob rau hauv qhov kev taw qhia rov qab, nws yuav tawm los nrog lub cim rho tawm hauv qhov kev daws teeb meem.
Tom qab ntawd, pib ntawm txhua qhov chaw hauv lub voj voog, peb xav txog kev mus ncig ib ncig ntawm lub voj voog, ntxiv emfs thiab IR cov nqe lus thaum peb tuaj rau lawv.
Qhov thib ob , Thaum peb mus ncig los ntawm qhov chaw hauv qhov kev taw qhia los ntawm - mus rau +, lub emf raug suav hais tias yog qhov zoo; thaum peb mus ncig los ntawm + mus rau -, lub emf raug suav hais tias yog qhov tsis zoo.
Qhov thib peb , Thaum peb mus ncig los ntawm lub resistor hauv tib qho kev coj ua li qhov tam sim no xav tias, IR lub sij hawm yog qhov tsis zoo vim tias tam sim no mus rau hauv kev coj ua ntawm kev txo qis peev xwm. Thaum peb mus ncig los ntawm lub resistor hauv qhov kev coj ua txawv ntawm qhov tam sim no xav tias, IR lub sij hawm yog qhov zoo vim tias qhov no sawv cev rau kev nce ntawm peev xwm.
Qhov kev taw qhia ntawm tam sim no raug xaiv tib yam li qhov kev taw qhia clockwise:
E 1 – IR 1 – IR 2 – IR 3 – E 2 = 0
20 – Kuv(2) – Kuv(4) – Kuv(4) – 15 = 0
20 – 15 – Kuv (2) – Kuv (4) – Kuv (4) = 0
5 – 10 Kuv = 0
5 = 10 Kuv
Kuv = 5/10
Kuv = 0.5 Ampere
Cov hluav taws xob ntws hauv lub voj voog yog 0.5 Ampere. Cov hluav taws xob kos npe rau qhov zoo txhais tau tias qhov kev taw qhia ntawm cov hluav taws xob yog tib yam li qhov kev taw qhia clockwise.
Xam qhov sib npaug resistor (R):
Cov resistor 1 ( R 1 ), resistor 2 ( R 2 ) thiab resistor 3 (R 3 ) txuas ua ke . Cov resistor sib npaug:
R = R 1 + R 2 + R 3 = 2 Ω + 4 Ω + 4 Ω = 10 Ω
Qhov hluav taws xob kawg hauv resistor R (V)
V = IR = (0.5)(10) = 5 Volts
[irp]
2. Hauv lub voj voog raws li qhia hauv daim duab hauv qab no, nrhiav lub zog uas ploj mus hauv 3 -Ω resistor.
Tshuaj:
Paub:
Tus Resistor 1 (R1= 2 TZS Ω 
Tus Resistor 2 (R2 ) = 3 Ω
Tus Resistor 3 (R3 ) = 4 Ω
emf 1 (E 1 ) = 8 Volt
emf2 ( E2 ) = 10 Volt
Xav tau: Lub zog uas tau ploj mus hauv 3 -Ω resistor
Tshuaj:
Lub zog uas tau muab tso rau hauv 3 -Ω resistor :
P = VI
P = fais fab , V = qhov hluav taws xob hla lub resistor 3-Ω , Kuv = tam sim no hla lub resistor 3-Ω
Xam qhov hluav taws xob tam sim no (I) hla dhau los ntawm 3 -Ω resistor
Qhov kev taw qhia ntawm tam sim no raug xaiv tib yam li qhov kev taw qhia clockwise:
E 1 – IR 1 – IR 2 – IR 3 + E 2 = 0
8 – Kuv(2) – Kuv(3) – Kuv(4) + 10 = 0
18 – 9 Kuv = 0
18 = 9 Kuv
Kuv = 18 / 9
Kuv = 2 Ampere
Cov hluav taws xob ntws hauv lub voj voog yog 2 Ampere. Cov hluav taws xob kos npe rau qhov zoo txhais tau tias qhov kev taw qhia ntawm cov hluav taws xob yog tib yam li qhov kev taw qhia clockwise.
Cov voj voog txuas ua ke ua ntu zus kom cov hluav taws xob ntws hauv lub voj voog = cov hluav taws xob hla dhau 3- Ω resistor = 2 Ampere.
Xam qhov voltage (V) hla lub resistor 3-Ω
V = IR 2 = (2 A) (3 Ω) = 6 V
Lub zog uas tau muab tso rau hauv 3 -Ω resistor:
P = VI = (6 Volt) (2 Ampere) = 12 Volt Ampere = 12 Watt
[irp]
3. Raws li lub voj voog raws li pom hauv daim duab hauv qab no, qhov sib txawv ntawm cov ntsiab lus A thiab B yog dab tsi.
Paub:
Resistor 1 (R1= 2 TZS Ω 
Tus Resistor 2 (R2 ) = 3 Ω
Tus Resistor 3 (R3 ) = 4 Ω
emf 1 (E 1 ) = 8 Volt
emf2 (E2 ) = 10 Volt
Xav tau: Qhov sib txawv ntawm qhov muaj peev xwm (V) ntawm cov ntsiab lus A thiab B
Tshuaj:
Xam qhov hluav taws xob tam sim no (I) ntws hauv 3- Ω resistor
Qhov kev taw qhia ntawm tam sim no raug xaiv tib yam li qhov kev taw qhia clockwise:
- E 1 – IR 1 – IR 2 – E 2 – IR 3 = 0
– 8 – Kuv (2) – Kuv (3) – 10 – Kuv (4) = 0
– 18 – 9 Kuv = 0
– 18 = 9 Kuv
Kuv = -18 / 9
Kuv = - 2 Amperes
Cov hluav taws xob ntws hauv lub voj voog yog 2 Ampere. Cov hluav taws xob kos npe tsis zoo txhais tau tias qhov kev taw qhia ntawm cov hluav taws xob hluav taws xob tig rau sab laug.
Cov voj voog txuas ua ke ua ntu zus kom cov hluav taws xob ntws hauv lub voj voog = cov hluav taws xob hla dhau 3- Ω resistor = 2 Ampere.
Xam qhov sib txawv ntawm qhov muaj peev xwm (V) hla lub 3- Ω resistor:
V = IR 2 = (2 A) (3 Ω) = 6 V
[irp]
4. Raws li lub voj voog raws li pom hauv daim duab hauv qab no, qhov sib txawv ntawm lub zog hluav taws xob R 3 yog dab tsi.
Paub:
Resistor 1 (R1= 2 TZS Ω 
Tus Resistor 2 (R2 ) = 4 Ω
Tus Resistor 3 (R3 ) = 3 Ω
emf 1 (E 1 ) = 6 Volt
emf2 (E2 ) = 9 Volt
Xav tau: Qhov sib txawv ntawm qhov muaj peev xwm hla R3 resistor
Tshuaj:
Xam qhov hluav taws xob tam sim no ( I) hla dhau los ntawm R3 resistor
Qhov kev taw qhia ntawm tam sim no raug xaiv tib yam li qhov kev taw qhia clockwise:
E 1 – IR 1 – E 2 – IR 2 – IR 3 = 0
6 – 2 – 9 – 4 – 3 = 0
6 – 9 – 2I – 4I – 3I = 0
-3 – 9I = 0
-3 = 9I
Kuv = -3/9
Kuv = -1/3
Cov hluav taws xob ntws hauv lub voj voog yog 1/3 Ampere. Cov hluav taws xob kos npe tsis zoo txhais tau tias qhov kev taw qhia ntawm cov hluav taws xob hluav taws xob counterclockwise.
Cov voj voog txuas ua ke ua ntu zus kom cov hluav taws xob ntws hauv lub voj voog = cov hluav taws xob hla dhau R 3 resistor = 1/3 Ampere.
Xam qhov sib txawv ntawm qhov muaj peev xwm ( V) hla lub resistor R3
V = IR 3 = (1/3)(3) = 1 Volt
[irp]
5. Lub zog hluav taws xob ntawm cov ntsiab lus C thiab D = 4 Volts, nrhiav R!
Paub:
Resistor 1 (R1= 2 TZS Ω 
Tus Resistor 2 (R2 ) = 2 Ω
Tus tiv thaiv 3 (R 3 ) = R
emf1 (E1 ) = 8 Volt
emf2 (E2 ) = 4 Volt
Qhov sib txawv ntawm C thiab D (V CD ) = 4 Volts
Xav tau: R
Tshuaj:
VCD = IR
4 = IR
R = 4 / Kuv
… …………
Xam qhov hluav taws xob tam sim no (I) hla dhau R resistor
Qhov kev taw qhia ntawm tam sim no raug xaiv tib yam li qhov kev taw qhia clockwise:
- E 1 – 2I + E 2 – 2I – IR = 0
– 8 – 2I + 4 – 2I – I (4/I) = 0
– 8 – 2I + 4 – 2I – 4 = 0
– 8 + 4 – 4 – 2I – 2I = 0
– 8 – 4I = 0
– 8 = 4I
Kuv = -8 / 4
Kuv = -2 Amperes
Cov hluav taws xob ntws hauv lub voj voog yog 2 Ampere. Cov hluav taws xob kos npe tsis zoo txhais tau tias qhov kev taw qhia ntawm cov hluav taws xob hluav taws xob tig rau sab laug.
Cov voj voog txuas ua ke ua ntu zus kom cov hluav taws xob ntws hauv lub voj voog = cov hluav taws xob hla dhau R resistor = 2 Ampere.
R:
R = 4 / Kuv = 4 / 2 = 2 Ohm
