슬라이드 1

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2 전기회로 과목개요 과목명 : 전기회로 (059분반) 담당교수 : 김욱 ( 특공관 318호, kimwook@pusan.ac.kr) 주교재 Fundamentals of Electric Circuits, 6 th Ed. (Alexander & Sadiku) 평가방법 1차고사 : 30%, 2차고사 : 30%, 기말고사 : 30%, 리포트 / 태도 : 10% (1,2차중간고사및기말고사의최종점수는표준정규화후반영 ) 출석미달자는무조건 F처리 1,2차중간고사및기말고사평균 20점이하는무조건 F처리 수업시간중핸드폰사용자는퇴실조치 전체태도점수반영 1

3 전기회로 과목학습목표 전자기장과회로이론은전기공학의가장중요한기초과목 전기회로와관련된제이론 (Node & Mesh 해석법, 테브난 & 노턴정리, 중첩원리등 ) 을이해하고실제회로를해석하는데활용 전기회로의대표적인소자 (R, L, C, OP-Amp) 의특성을이해하고회로를해석하는방법 1 st 및 2 nd -order Circuit 해석법 회로이론 (I) 에서는주로직류 (DC), 회로이론 (II) 에서는교류 (AC) 에대한이론을다룸 2

Law) (Ch.2) 3-4주 Nodal 및 Mesh 해석법의이해 (Ch.

5) 9주 회로소자 (Capacitors & Inductors) 의특성이해

4 주요강의내용 1주 전기회로기본개념이해 (Ch.1) 2주 전기회로의기본법칙 (Ohm s law, Kirchhoff s Law) (Ch.2) 3-4주 Nodal 및 Mesh 해석법의이해 (Ch.3) 5주 1차중간고사 6-7주 Thevenin 및 Norton 정리를이용한회로해석 (Ch.4) 8주 Operational Amplifier의원리 (Ch.5) 9주 회로소자 (Capacitors & Inductors) 의특성이해 (Ch.6) 10주 2차중간고사 11-12주 First-Order Circuits의이해 (Ch.7) 13-14주 Second-Order Circuits의이해 (Ch.8) 15주 Final Exam 3

5 전기회로 과목의활용 Advanced Course( 회로이론, 전자회로, 전력공학, 전력전자, 전기기기, 반도체, 컴퓨터설계등 ) 의수강을위한필수이수과목 각종시험, 자격증의필수과목 ( 대학원입학, 전기기사등의자격증시험, 입사시험등 ) 하드웨어관련직종취업시가장많이활용되는지식 일상생활및취미활동에활용 ( 예 : 오디오제작 ) 4

6 Ch.1. Basic Concepts

7 전기회로의정의 전기회로의정의 : 전기소자의상호연결 (Interconnection of electrical elements) 대표적인전기소자 -전원 -저항(Resistance) -인덕터(Inductance) -콘덴서(Capacitor) -Switch 6

8 SI Units (Int l System of Units) 기본적인 SI Units SI Prefix 7

9 System of Units The derived units commonly used in electric circuit theory Quantity Unit Symbol Electric charge Coulomb C Electric potential Volt V Resistance Ohm Ω Conductance Siemens or Mho S, Inductance Henry H Capacitance Farad F Frequency Hertz Hz Force Newton N Energy, Work Joule J Power Watt W 8

10 전하와전류 전하 (Electric Charge) : 어떤물체또는물질이가지고있는전기적성질또는전기의양을의미함 - Unit : 쿨롱 (Coulomb, 표기 : C) - 전자및양자의전하량 : x10-19 C 일반적으로자연에서발견되는전하량은 1.602x10-19 C 의정배수 - 전하량보존의법칙 의성립 - 도체에서는전하가자유롭게이동할수있으며음전하 ( 전자 ) 이동의반대방향을전류방향으로정의 (Benjamin Franklin s convention) 9

11 전하와전류 전류 (Electric Current) : 단위시간당전하량의변화 (Time rate of change of electric charge) dq t - 수학적표현 : i or q dt i () t dt t 0 - Unit : ampere[a] = coulomb / second [C/sec] 직류와교류 - 직류 (DC, direct current) : a current that remains constant - 교류 (AC, alternating current) : a current that varies sinusoidally 직류는일반적으로 italic 대문자로, 교류는 italic 소문자로표시 11

12 전하와전류 Example 1.1 How much charge is represented by 4,600 electrons? Example 1.2 The total charge entering a terminal is given by q=5t sin4πt [mc]. Calculate the current at t = 0.5 sec. Example 1.3 Determine the total charge entering a terminal between t=1 and t=2 if the current passing the terminal is i=(3t 2 t) [A]. 10

13 전하와전류 전류의방향 - Direction of positive charge movement - Positive & negative current 12

14 전압 전압또는전위차 (Voltage or Electric Potential Difference) : The energy required to move a unit charge through an element dw - 수학적표현 : v dq - Unit : [V] = [Joule / Coulomb] = [Newton meter / Coulomb] 전압의방향 - ( 그림 a) point a의전압은 point b 보다 9V 높다 - ( 그림 b) point b의전압은 point a 보다 9V 낮다 13

15 전압 Example 1.4 An energy source forces a constant current of 2A for 10sec to flow through a light bulb. If 2.3kJ is given off in the form of light and heat energy, calculate the voltage drop across the bulb. 14

16 전력과전력량 전력 (Power) : the time rate of expending or absorbing energy dw dw dq -수학적표현 : p v i dt dq dt - Unit : [Watt] = [Joule / Sec] = [Volt Ampere] 전력의부호에대한 convention - ( 그림 a) p>0이면 element에의하여전력이소비됨을의미 - ( 그림 b) p<0이면 element가전력을공급함을의미 15

17 전력과전력량 전력의부호에대한 convention (2) 16

18 전력과전력량 전력량 (Energy) : 일정기간동안 element에의하여흡수 / 공급된전력 (the capacity to do work) - 수학적표현 : w p () t dt vi dt t0 t0 - 단위 : [Watt sec] or [Watt hour] t t 전력량보존의법칙 (law of conservation of energy) : p 0 공급된전력량 (energy supplied) = 흡수된전력량 (energy absorbed) 17

19 전력과전력량 Example 1.5 Find the power delivered to an element at t=3 ms if the current entering its positive terminal is i=5 cos60 πt [A] and the voltage is : (a) v=3i, (b) v = 3 di/dt Example 1.6 How much energy does a 100-W electric bulb consume in two hours? 18

20 회로소자 (Circuit Elements) 회로소자의구분 - Active element : Energy를생성할수있는소자예 ) Generator, Battery, Op-Amp - Passive element : Energy를생성할수없는소자예 ) Resistor, Inductor, Capacitor 19

21 회로소자 (Circuit Elements) Ideal Independent Voltage / Current Source an active element that provides a specified voltage or current that is completely independent of other circuit element Ideal Independent Voltage sources Ideal Independent Current sources 20

22 회로소자 (Circuit Elements) Ideal Dependent (Controlled) Voltage / Current Source an active element in which the source quantity is controlled by another voltage or current ( 대부분 OP-Amp로구현 ) - VCVS : Voltage controlled voltage source - CCVS : Current controlled voltage source - VCCS : Voltage controlled current source - CCCS : Current controlled current source 21

23 회로소자 (Circuit Elements) Example 1.7 Calculate the power supplied or absorbed by each element. 22

24 회로소자 (Circuit Elements) Example 1.8 The electron beam in a TV picture tube carries electrons per second. Determine the voltage Vo needed to accelerate the electron beam to achieve 4W. 23

25 회로소자 (Circuit Elements) Example

歯회로이론

歯회로이론 1 1 2 3 4 5,, ( ) 1-1 (capacitor) (inductor) 1-1 1-4 1-1 (lead) 1-2 1-3 1-4 ( ) 1-5 1-6 ( c o i l ), 1-7 1-8 1-5 1-6,, 1-9 1-7 1-8 1-9 1-10 : (a), (b), (c), (d) 1-10,,, (multimeter) 1 4 2 3 4 5 1-2,,,,,