Lecture Electric circuit theory: Basic laws - Nguyễn Công Phương

Magnetically Coupled Circuits XIII.Frequency Response. XIV.The Laplace Transform XV.[r]

Electric Circuit Theory

Basic Laws

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Contents

II Basic Laws

III Electrical Circuit Analysis

IV Circuit Theorems

V Active Circuits

VI Capacitor And Inductor

VII First Order Circuits

VIII.Second Order Circuits

IX Sinusoidal Steady State Analysis

X AC Power Analysis

XI Three-phase Circuits

XII Magnetically Coupled Circuits

XIII.Frequency Response

XIV.The Laplace Transform

XV Two-port Networks

Basic Laws

1 Ohm’s law

2 Nodes, branches, and loops

3 Kirchhoff’s laws

4 Series subcircuits

5 Parallel subcircuits

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Ohm’s law (1)

v = Ri

Slope = R

v

i

p(t) = v(t)i(t)

→ p(t) = Ri 2 (t)

1

R

Ohm’s law (2)

+

–

v

i

i R eq

Slope = R

v

i

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Ohm’s law (3)

+ –

i(t)

v

v s = 0

i(t)

v

R = 0

i(t)

v

i s = 0

i(t)

v

R = ∞

i(t)

v

i(t)

v

Short circuit

Open circuit

Basic Laws

1 Ohm’s law

2 Nodes, branches, and loops

3 Kirchhoff’s laws

4 Series subcircuits

5 Parallel subcircuits

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Nodes, branches, and loops (1)

A branch represents a single element

–

R 1

R 2

R 3

R 4

E 1

E 2

J

Nodes, branches, and loops (2)

A node is the point of connection between two or more branches

d

–

R 1

R 2

R 3

R 4

E 1

E 2

J

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Nodes, branches, and loops (3)

A loop is any closed path in a circuit

b = l + n – 1

–

R 1

R 2

R 3

R 4

E 1

E 2

J