Download - 05 circuitos elétricos
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CIRCUITOS
ELÉTRICOS
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CIRCUITOS ELÉTRICOS
COMPLEXOS
NA PRÁTICA NADA MAIS SÃO
QUE SIMPLES ASSOCIAÇÕES
DE DOIS TIPOS
DE CIRCUITOS FUNDAMENTAIS:
CIRCUITO EM SÉRIE.
CIRCUITO PARALELO.
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CIRCUITOS SÉRIE.
CIRCUITOS SÉRIE.
CIRCUITOS SÉRIE.
CIRCUITOS SÉRIE.
CIRCUITOS SÉRIE.
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QUANDO AS RESISTÊNCIAS SÃO
CONECTADAS UMA EM SEGUIDA
DA OUTRA.
CIRCUITOS SÉRIE.
A CORRENTE É A MESMA EM
TODAS ELAS.
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CIRCUITO SÉRIE.
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CIRCUITO SÉRIE.
Quando retiramos uma lâmpada....
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CIRCUITO SÉRIE.
Quando retiramos uma lâmpada....
... Todas se
apagam.
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V
120 V
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V
120 V V
120 V
V 120 V
20 V
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120 V V
20 V
V
20 V
40 V
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120 V
V
20 V
40 V
V 60 V
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120 V
A
40 V
40 V
40 V
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120 V
A
20 V
40 V
60 V
2 A
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120 V
40 V
40 V
40 V
2 A
A
A
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120 V
20 V
40 V
60 V
2 A
A
2 A
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120 V
40 V
40 V
40 V
2 A
2 A
A
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120 V
20 V
40 V
60 V
2 A
2 A
A 2 A
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120 V
20 V
40 V
60 V
2 A
2 A
2 A
A corrente é a
mesma e a tensão
se divide entre as
resistências
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RESISTÊNCIA EQUIVALENTE
Uma única resistência que
colocada no lugar das outras,
submetida a mesma tensão,
permitirá a passagem do mesmo
valor de corrente
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120 V
2 A
120 V
2 A
RESISTÊNCIA EQUIVALENTE
R1
R2 R3
Re = R1 + R2 + R3
Re
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QUANDO AS RESISTÊNCIAS SÃO
CONECTADAS LADO A LADO (INÍCIO
COM INÍCIO, FINAL COM FINAL)
CIRCUITO PARALELO.
criando assim mais de
um caminho para a corrente.
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CIRCUITO PARALELO.
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Quando retiramos uma lâmpada....
CIRCUITO PARALELO.
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Quando retiramos uma lâmpada...
CIRCUITO PARALELO.
... As demais
permanecem
acesas.
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V
120 V
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V
120 V
V
120 V
V 120 V V 120 V
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V 120 V
120 V
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V 120 V
120 V
120 V
120 V
120 V
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A
120 V
120 V
120 V
120 V
120 V
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A
2 A
120 V
120 V 120 V
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2A
120 V
120 V 120 V
A
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2 A
120 V
120 V 120 V
A
1 A
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A
120 V
120 V 120 V
2 A
1 A A
A
A
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2A
120 V
120 V 120 V
2A A
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2 A
120 V
120 V 120 V
1 A A
1 A
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2 A
120 V
120 V 120 V
1 A 1 A
A tensão é a mesma e a corrente se divide entre as resistências
As resistências são independentes
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PARA CALCULARMOS A
RESISTÊNCIA EQUIVALENTE
DO CIRCUITO PARALELO
USAREMOS A FÓRMULA
= Re
1
R1
1 +
R2
1 +
R3
1 +...
Rn
1
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Re
1
R1
1
R2
1
R3
1 = + + +...
Rn
1
= Re
1
R1
1 +
R2
1 +
R3
1 +...
Rn
1
= Re
1
R1
1 +
R2
1 +
R3
1 +...
Rn
1
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= Re
1
R1
1 +
R2
1 +
R3
1 +...
Rn
1
PARA DUAS
RESISTÊNCIAS EM PARALELO
USAREMOS A FÓRMULA
= Re R1 x R2
R1 + R2
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NOTA
A RESISTÊNCIA
EQUIVALENTE DE UM
CIRCUITO PARALELO É
SEMPRE MENOR QUE A
MENOR RESISTÊNCIA DO
CIRCUITO
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RESUMO DE FÓRMULAS
Re
1
R1
1
R2
1
R3
1
Rn
1
CIRCUITO SÉRIE
CIRCUITO PARALELO
= + + +...
Re = R1 + R2 + Rn R3 +...
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EXISTEM RESISTÊNCIAS, TANTO EM SÉRIE COMO
EM PARALELO.
CIRCUITO MISTO
R1 R2 R3
R4
R5
R6
R7
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EXEMPLO DE RESITÊNCIA
EQUIVALENTE
DE UM CIRCUITO MISTO
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R1 e R2 Estão em série
R1 R2 R3
R4
R5
R6
R7
Re1= R1 + R2
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Re1 R3
R4
R5
R6
R7
R1 e R2 Estão em série
Re1 = R1 + R2
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Re1 R3
R4
R5
R6
R7
R3 e R4 Estão em série
Re2 = R3 + R4
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Re1
Re2
R5
R6
R7
R3 e R4 Estão em série
Re2 = R3 + R4
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Re1
Re2
R5
R6
R7
R6 e R7 Estão em série
Re3 = R6 + R7
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R6 e R7 Estão em série
Re3 = R6 + R7
Re1
Re2
R5
R e3
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Re2 e Re3 Estão em paralelo
Re4 =
Re1
Re2
R5
Re3
Re2 x Re3
Re2 + Re3
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Re1
Re4
R5
Re2 e Re3 Estão em paralelo
Re4 = Re2 x Re3
Re2 + Re3
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Re1
Re4
R5
Re1 , Re4 e R 5 Estão em série
Re= Re1 + Re4 + R 5
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Re
Re= Re1 + Re4 + R 5
Re1 , Re4 e R 5 Estão em série