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CIRCUITOS DE
CORRIENTE CONTINUA
FISICA PROF:RUBEL LINARES MÁLAGA
CIRCUITO ELÉCTRICO
 Con frecuencia, los circuitos eléctricos contienen uno o
más resistores agrupados y unidos a una fuente de
energía, como una batería.
 Los siguientes símbolos se usan con frecuencia:
FISICA PROF:RUBEL LINARES MÁLAGA
Primera regla de Kirchhoff: La suma de las corrientes que entran a un
nodo es igual a la suma de las corrientes que salen del nodo.
Segunda regla de Kirchhoff: La suma de las diferencias de potencial
alrededor de cualquier malla o circuito cerrado debe ser igual a cero.
Regla del nodo: SI (entrada) = SI (salida)
Regla de las mallas: ∆𝑽 𝑪𝒊𝒓𝒄𝒖𝒊𝒕𝒐
𝒄𝒆𝒓𝒓𝒂𝒅𝒐
= 𝟎
REGLAS DE KIRCHHOFF PARA CIRCUITOS CD
FISICA PROF:RUBEL LINARES MÁLAGA
CONVENCIONES DE SIGNOS PARA FEM
 Cuando aplique las reglas de Kirchhoff debe suponer una dirección de
recorrido del circuito.
 Cuando aplique la regla de las mallas, las fem tomaran el signo
positivo o negativo de acuerdo al sentido del recorrido cuando se pasa
por la batería, es decir, de positivo a negativo o viceversa.
 Si el recorrido es de A a B, esta
fem se considera positiva.
 Si el recorrido es de B a A, esta
fem se considera negativa.
FISICA PROF:RUBEL LINARES MÁLAGA
SIGNOS DE CAÍDAS IR EN CIRCUITOS
 Cuando aplique la regla de las mallas, la caída de tensión IR en
el resistor es positiva si dicho resistor se atraviesa con el
recorrido en la dirección opuesta a la corriente y negativa si
dicho resistor se atraviesa con el recorrido en la dirección de la
corriente.
 Si el recorrido es de A a B,
esta caída IR es negativa.
 Si el recorrido es de B a A,
esta caída IR es positiva.
FISICA PROF:RUBEL LINARES MÁLAGA
REGLAS DE KIRCHHOFF: NODO Y MALLA
Regla de nodos: I2 = I1 + I3
Regla de mallas (I): SΔV= 0
E1 + E2 - I1R1 - I2R2 = 0
Malla I
Malla II
FISICA PROF:RUBEL LINARES MÁLAGA
Regla de mallas (II): SΔV= 0
E2 + E3 -I2R2 - I3R3 = 0

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Leyes de kirchhoff

  • 1. CIRCUITOS DE CORRIENTE CONTINUA FISICA PROF:RUBEL LINARES MÁLAGA
  • 2. CIRCUITO ELÉCTRICO  Con frecuencia, los circuitos eléctricos contienen uno o más resistores agrupados y unidos a una fuente de energía, como una batería.  Los siguientes símbolos se usan con frecuencia: FISICA PROF:RUBEL LINARES MÁLAGA
  • 3. Primera regla de Kirchhoff: La suma de las corrientes que entran a un nodo es igual a la suma de las corrientes que salen del nodo. Segunda regla de Kirchhoff: La suma de las diferencias de potencial alrededor de cualquier malla o circuito cerrado debe ser igual a cero. Regla del nodo: SI (entrada) = SI (salida) Regla de las mallas: ∆𝑽 𝑪𝒊𝒓𝒄𝒖𝒊𝒕𝒐 𝒄𝒆𝒓𝒓𝒂𝒅𝒐 = 𝟎 REGLAS DE KIRCHHOFF PARA CIRCUITOS CD FISICA PROF:RUBEL LINARES MÁLAGA
  • 4. CONVENCIONES DE SIGNOS PARA FEM  Cuando aplique las reglas de Kirchhoff debe suponer una dirección de recorrido del circuito.  Cuando aplique la regla de las mallas, las fem tomaran el signo positivo o negativo de acuerdo al sentido del recorrido cuando se pasa por la batería, es decir, de positivo a negativo o viceversa.  Si el recorrido es de A a B, esta fem se considera positiva.  Si el recorrido es de B a A, esta fem se considera negativa. FISICA PROF:RUBEL LINARES MÁLAGA
  • 5. SIGNOS DE CAÍDAS IR EN CIRCUITOS  Cuando aplique la regla de las mallas, la caída de tensión IR en el resistor es positiva si dicho resistor se atraviesa con el recorrido en la dirección opuesta a la corriente y negativa si dicho resistor se atraviesa con el recorrido en la dirección de la corriente.  Si el recorrido es de A a B, esta caída IR es negativa.  Si el recorrido es de B a A, esta caída IR es positiva. FISICA PROF:RUBEL LINARES MÁLAGA
  • 6. REGLAS DE KIRCHHOFF: NODO Y MALLA Regla de nodos: I2 = I1 + I3 Regla de mallas (I): SΔV= 0 E1 + E2 - I1R1 - I2R2 = 0 Malla I Malla II FISICA PROF:RUBEL LINARES MÁLAGA Regla de mallas (II): SΔV= 0 E2 + E3 -I2R2 - I3R3 = 0