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Pertemuan 1

Circuit Analysis andElectrical Engineering

Matakuliah : H0042/Teori Rangkaian Listrik

Tahun : 2005

Versi : <<versi/01

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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa

akan mampu :

• Memberikan definisi tegangan dan arus

• Mengidentifikasi hukum-hukum dasar rangkaian listrik

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Outline Materi

• Materi 1 : Telusuran penyelesaian soal

• Materi 2 : Pengertian arus dan tegangan

• Materi 3 : Pengenalan simbol-simbol RL

• Materi 4 : Hukum Ohm

• Materi 5 : Aplikasi Hukum Ohm

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Chapter 1 Circuit Analysis andElectrical Engineering

Engineering Circuit Analysis Sixth Edition

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin

Copyright © 2002 McGraw-Hill, Inc. All Rights Reserved.

A suggested problem-solving flow chart

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A suggested problem-solving flow chart

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

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Basic Components and Electric Circuits

Engineering Circuit Analysis Sixth Edition

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin

Copyright © 2002 McGraw-Hill, Inc. All Rights Reserved.

Fig. 2.1 “Charge flowing through a wire…”

Figs. 2.5 and 2.6 Current labeling conventions

Figs. 2.9 and 2.10 Voltage labeling conventions

Fig. 2.12 “The power absorbed by the element is…”

Figs. 2.16 - 2.18 Circuit symbols for various sources

Fig. 2.19 Circuit for Example 2.2

Fig. 2.20 Circuit for Practice Problem 2.20

Fig. 2.23 Ohm’s Law

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Fig. 2.1 “Charge flowing through a wire…”

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

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Current labeling conventions

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

Two different methods of labeling the same current.

(a,b) Incomplete, improper, and incorrect definitions of a current. (c) the correct definition of i1(t).

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Voltage labeling conventions

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

(a, b) These are inadequate definitions of a voltage. (c) A correct definition includes both a symbol for the variable and a plus-minus symbol pair.

(a, b) Terminal B is 5 V positive with respect to terminal A; (c,d) terminal A is 5 V positive with respect to terminal B.

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Fig. 2.12 “The power absorbed by the element is…”

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

If the current arrow is directed into the “ +” marked terminal of an element, then p = vi yields the absorbed power. A negative value indicates that power is actually being generated by the element.

If the current arrow is directed out of the “ +” terminal of an element, then p = vi yields the supplied power. A negative value in this case indicates that power is actually being absorbed instead of generated.

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Circuit symbols for various sources

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

Symbol for: (a) DC voltage source; (b) battery; (c) ac voltage source.

Symbol for an independent current source.

The four different types of dependent sources:(a) current-controlled current source;(b) voltage-controlled current source;(c) voltage-controlled voltage source;(d) current-controlled voltage source.

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Fig. 2.19Circuit for Example 2.2

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

In the circuit below ,if v2 is known to be 3 V, find vL .

If v2 = 3 V

Then it can be consider that :

5v2 = (5 x 3) V = 15 V

vL = 5 v2

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Find the power absorbed by each element in the circuit below.

Circuit for Practice Problem

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

W7A = 56 W ; W8V = 16 W ; W-12V = - 60W

W20V = 160 W ; W20VDependent = 0.25 . –12 . 20 = -60 W

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Fig. 2.23 Ohm’s Law

W.H. Hayt, Jr., J.E. Kemmerly, S.M. Durbin, Engineering Circuit Analysis, Sixth Edition.

Copyright ©2002 McGraw-Hill. All rights reserved.

v = i R

or

i = R

v

Ohm’s Law

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RESUME

• Arus ditentukan oleh arah dan variabel arus.

• Tegangan ditentukan oleh polaritas dan variabel tegangan.

• Karakteristik sumber tegangan dan arus ditentukan oleh sifat indepedent dan dependent terhadap beban.