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PRÁCTICA 4
RESISTENCIAS EN PARALELO
Objetivos
Perfecta y rápida identificación de las distintas resistencias para su posterior montaje en paralelo. Comprobación práctica de la ley de Ohm y la teoría de los circuitos paralelos.
Perfeccionar el conocimiento de la F.A y del polímetro (óhmetro, voltímetro y amperímetro), tanto analógico como digital.
Esquema
CIRCUITO 1
R1 R2 R3 R4 R5
CIRCUITO 2
R1 R5 R4 R3 R2 R1
R1 = 1Kð
R2 = 1Kð
R3 = 330 ð
R4 = 470 ð
R5 = 2Kð
Cálculos
1
RT1=
1 1 1 1 1
1000 1500 330 470 2200
1
0,001 + 0,0006 + 0,0030 + 0,0021 + 0,00045
1
RT1=
0,00715
RT2= R5 + R4 + R3 + R2 + R1 = 2200//470//330//1500//1000= 137,378 ð
Vab= 5v
IT= v/r = 5v/137,4=0,0036 A = 3,6 mA
I1= V1 / R1 = 5v / 1000 = 0,005 A = 5 mA
I2= V2 / R2 = 5v / 1500 = 0,003 A = 3 mA
I3= V3 / R3 = 5v / 330 = 0,015 A = 15 mA
I4= V4 / R4 = 5v / 470 = 0,0106 A = 10,6 mA
I5= V5 / R5 = 5v / 2200 = 0,00227 A = 2,27 mA
Vab= 12v
IT= v/r = 12v/137,4=0,087 A = 87 mA
I1= V1 / R1 = 12v / 1000 = 0,012 A = 12 mA
I2= V2 / R2 = 12v / 1500 = 0,008 A = 8 mA
I3= V3 / R3 = 12v / 330 = 0,03636 A = 36,36 mA
I4= V4 / R4 = 12v / 470 = 0,025 A = 25 mA
I5= V5 / R5 = 12v / 2200 = 0,0054 A = 5,4 mA
V1=V2=V3=V4=V5
La tensión es la misma en los dos circuitos.
Medidas
TESTER ANALÓGICO
5v 12v
TESTER DIGITAL
5v 12v
VAB1
5v
11,9v
4,9v
11,9
VAB2
5v
11,9v
4,9v
11,9
V1
5v
11,9v
4,9v
11,9
I1
0,0055A
0,013A
0,0052 A
0,0012 A
V2
5v
11,9v
4,9v
11,9
I2
0,0030 A
0,008 A
0,0030 A
0,008 A
V3
5v
11,9v
4,9v
11,9
I3
0,012 A
0,035 A
0,0014 A
0,035 A
V4
5v
11,9v
4,9v
11,9
I4
0,09 A
0,025 A
0,0011 A
0,025 A
V5
5v
11,9v
4,9v
11,9
I5
0,0021 A
0,006 A
0,0022 A
0,0053 A
Conclusiones
Creo que he aprendido a utilizar el polímetro, ya que la relación entre medidas y
cálculos parece dar más aproximada.
Esta practica, no ha sido dificil, pero al montar el circuito paralelo en la placa de
baquelita me ha costado más medir con el tester, ya que tenia que desoldar y soldar
continuamente resistencias para poder medir correctamente.
En la próxima práctica, haré el circuito mediante hilo rígido para tener mayor rapidez a
la hora de usar el polímetro.
+
+
+
+
137,378 ð
=
Descargar
Enviado por: El remitente no desea revelar su nombre Idioma: castellanoPaís: España