circuit mixt
TRANSCRIPT
![Page 1: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/1.jpg)
R1 = 2 Ω
R2 = 3 Ω
R3 = 2 Ω
R4 = 4 Ω
R5 = 4 Ω
R6 = 12 Ω
12 V
quina potència dissipa cada resistència en un circuit sèrie-paral·lel
Carolina Crespo. Tecno-Lògics Bellvitge
![Page 2: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/2.jpg)
RT = R1 + R2
1 1 1 RT = R1 + R2
= +
V = V1-2 + V2-3
I = I1 + I2
RECORDEU:
sèrie
paral·lel
llei d’OhmP = I · V
![Page 3: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/3.jpg)
R1 = 3 Ω
R2 = 3 Ω
R3 = 2 Ω
R4 = 4 Ω
R5 = 4 Ω
R6 = 12 Ω
12 V
COMENCEM
RtI
12 V
V
=
trobant la Resistència Equivalent
per aplicar la Llei d’Ohm i calcular I
![Page 4: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/4.jpg)
R1 = 3 Ω
R2 = 3 Ω
R3 = 2 Ω
R4 = 4 Ω
R5 = 4 Ω
R6 = 12 Ω
12 V
1/R345 = 1/R3 + 1/R4 + 1/R5 = 1/2 + 1/4 + 1/4
COMENCEMtrobant la Resistència Equivalent
![Page 5: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/5.jpg)
R1 = 3 Ω
R2 = 3 Ω R345 = 1 Ω
R6 = 12 Ω
12 V
COMENCEMtrobant la Resistència Equivalent
1/R345 = 1/R3 + 1/R4 + 1/R5 = 1/2 + 1/4 + 1/4
![Page 6: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/6.jpg)
R1 = 3 Ω
R2 = 3 Ω R345 = 1 Ω
R6 = 12 Ω
12 V
R2345 = R2 + R345 = 3 + 1
COMENCEMtrobant la Resistència Equivalent
![Page 7: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/7.jpg)
R1 = 3 Ω
R2345 = 4 Ω
R6 = 12 Ω
12 V
COMENCEMtrobant la Resistència Equivalent
R2345 = R2 + R345 = 3 + 1
![Page 8: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/8.jpg)
R1 = 3 Ω
R2345 = 4 Ω
R6 = 12 Ω
12 V
1/R23456 = 1/R2345 + 1/R6 = 1/4 + 1/12
COMENCEMtrobant la Resistència Equivalent
![Page 9: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/9.jpg)
R23456 = 3 Ω
12 V
R1 = 3 Ω
COMENCEMtrobant la Resistència Equivalent
1/R23456 = 1/R2345 + 1/R6 = 1/4 + 1/12
![Page 10: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/10.jpg)
R1 = 3 Ω R23456 = 3 Ω
12 V
Rt = R1 + R23456 = 3 + 3
COMENCEMtrobant la Resistència Equivalent
![Page 11: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/11.jpg)
Rt = R1 + R23456 = 3 + 3
COMENCEMtrobant la Resistència Equivalent
Rt = 6 Ω
V = 12 V
![Page 12: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/12.jpg)
Rt = 6 ΩI
I = V / Rt = 12 V / 6 Ω = 2 A
ara ja podem calcular la Intensitat
V = 12 V
i la Potència total dissipada pel circuit
P = I · V = 2 A · 12 V = 24 W
CALCULEM
![Page 13: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/13.jpg)
R23456 = 3 Ω
12 V
R1 = 3 Ω
TORNEM ENRERA
I = 2 A
V1 V26
V1 = I · R1 = 6V P1 = I · V1 = 12 WV26 = I · R23456 = 6V P23456 = I · V26 = 12 W
comprovem : V1 + V26 = 12 V P1 + P23456 = P = 24 W
per calcular la potència dissipada per cada resistència
![Page 14: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/14.jpg)
R1 = 3 Ω
R2345 = 4 Ω
R6 = 12 Ω
12 V
I = 2 A
I1
I2
V26 = 6 VV1 = 6 V
I1 = V26 / R2345 = 1,5V P2345 = I1 · V26 = 9WI2 = V26 / R6 = 0,5V P6 = I2 · V26 = 3W
TORNEM ENRERA
comprovem : I1 + I2 = I = 2 A P2345 + P6 = P26 = 12 W
per calcular la potència dissipada per cada resistència
![Page 15: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/15.jpg)
R1 = 3 Ω
R2 = 3 Ω R345 = 1 Ω
R6 = 12 Ω
12 V
TORNEM ENRERA
V2 = I1 · R2 = 4,5 V P2 = I1 · V2 = 6,75 WV35 = I1 · R345 = 1,5 V P345 = I1 · V35 = 2,25 W
I = 2 A
I1 = 1,5A
I2 = 0,5 A
V26 = 6 VV1 = 6 V
V2 V35
comprovem : V2 + V35 = V26 = 6 V P2 + P345 = P2345 = 9 W
per calcular la potència dissipada per cada resistència
![Page 16: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/16.jpg)
R1 = 3 Ω
R2 = 3 Ω
R3 = 2 Ω
R4 = 4 Ω
R5 = 4 Ω
R6 = 12 Ω
12 V
TORNEM ENRERA
I = 2 A
I1 = 1,5A
I2 = 0,5 A
V26 = 6 VV1 = 6 V
V2= 4,5 V V35 = 1,5 V
I11
I13
I11 = V35 / R3 = 0,75 A P3 = I11 · V35 = 1,125 WI12 = V35 / R4 = 0,375 A P4 = I12 · V35 = 0,5625 WI12 = V35 / R5 = 0,375 A P5 = I13 · V35 = 0,5625 W
comprovem : I11 + I12 + I13 = I1 = 1,5 A P3 + P4 + P5 = P345 = 2,25 W
I12
![Page 17: Circuit mixt](https://reader036.vdocuments.net/reader036/viewer/2022071813/55a352601a28abf3478b4853/html5/thumbnails/17.jpg)
R1 = 3 Ω
R2 = 3 Ω
R3 = 2 Ω
R4 = 4 Ω
R5 = 4 Ω
R6 = 12 Ω
12 V
I = 2 A
1,5A
0,5 A
6 V6 V
4,5 V 1,5 V
0,75 A
0,375 A
0,375 A
circuit resolt !
P1 = 12 W
P2 = 6,75 W
P3 = 1,125 W
P4 = 0,5625 W
P5 = 0,5625
P6 = 3 W
Pt = 24 W
potència dissipadaper cada resistència