Electric Circuit - Introduction + Lecture#1


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Electric Circuit - Introduction + Lecture#1

  1. 1. EEE 121: ELECTRIC CIRCUIT ANALYSIS - I Ahsan Khawaja ahsan_khawaja@comsats.edu.pk Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad
  2. 2. Marks Distribution (Theory – 3 credits = 75%) Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad Sessional-I = 10 Assignments = 10 Sessional-II = 15 Terminal Exam = 50 Quizzes = 15 Total Marks = 100 Lab work incl. pre-lab = 25 Attendance = 10 Lab reports, assignments = 25 Terminal exam and viva voce = 40 Total Marks = 100 (Laboratory – 1 credit = 25%) EEE 121: ELECTRIC CIRCUIT ANALYSIS - I
  3. 3. • Textbook: – Electric Circuits, James W. Nilsson and Susan A. Riedel, 8th edition. – Fundamentals of Electric Circuits, Charles K. Alexander and Mathew Sadiku, 2nd edition. • Reference Texts: – Basic Engineering Circuit Analysis, David J. Irwin, 7th edition. Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad EEE 121: ELECTRIC CIRCUIT ANALYSIS - I
  4. 4. High level lecture breakdown Circuit Variables and Circuit Elements: Voltage, Current, resistors, Power and Energy, Passive sign conventions, Voltage/Current sources, Ohm’s Law, Kirchhoff’s Law, Dependent sources. Cramers’ rule Resistive Circuits: Series/Parallel combinations, Voltage/Current divider circuits, The Wheatstone Bridge, Delta-to-Wye conversion. Techniques of Circuit Analysis: Node-voltage method with/without dependent sources (and special cases), Mesh-current methods with/without dependent sources (and special cases), Source transformations, Superposition, Thevenin/Nortorns Equivalents, Maximum power theorem. Inductance, capacitance and Mutual Inductance: Inductance, series/parallel combinations of inductors, Capacitance, series parallel combinations of capacitance, Mutual inductance First Order RL and RC Circuits: Natural response of RL/RC circuits, Step response of RL/RC circuits. Sequential Switching and Unbounded response. Second Order RLC Circuits: Natural and Step responses of a parallel and series RLC circuit.
  5. 5. List of Experiment Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad EEE 121: ELECTRIC CIRCUIT ANALYSIS - I Lab # Lab Title 1. Introduction to Lab Instruments 2. Identifying Resistor Color-Codes and Verifying Ohm's Law 3. Resistor Combinations - Series And Parallel 4. Kirchhoff’s Laws and Voltage/Current-Division 5. Voltmeter Design Using Galvanometer 6. Ammeter Design Using Galvanometer 7. Determining Internal Resistance of a Voltage Source 8. Node-Voltage Method 9. Mesh-Current Method 10. Superposition Theorem 11. Thevenin's Theorem 12. Norton's Theorem 13. Maximum Power Transfer Theorem 14. Natural Response of an RC Circuit 15. Lt. Spice (software)
  6. 6. Overview of electric power 3 main issues pertaining to electric power… • Generation • Transmission • Distribution
  7. 7. Electric Power Uses • Lighting, heating, cooling and other domestic electrical appliances used in home/office. • Irrigating vast agricultural lands using Tube wells. • Running motors, furnaces of various kinds, in industries. • Amount of national electrical power consumption used as an indicator of economic prosperity.
  8. 8. Power generation P = (V x I)Watts • Early 18th century, electrical power generated and stored in the form of DC batteries. • Limitations – Low current/voltage achieved. – Not feasible to transmit power over long distances. – Area specific generation and distribution resulted in cost prohibitive deployment.
  9. 9. From DC to AC • Faraday’s Laws of electromagnetic Induction A diagram of Faraday's iron ring apparatus. Change in the magnetic flux of the left coil induces a current in the right coil
  10. 10. From DC to AC • A power system with 3-phase, 50 Hz A.C generation, transmission and distribution networks. – transmission of large power (MW) at higher transmission voltage. – Level of voltage could be changed virtually to any other desired level with transformers which is impossible in DC systems • Nicola Tesla suggested simpler electrical motors (induction motors) • Tesla’s arguments resulted in mass switchover from D.C to A.C systems.
  11. 11. From DC to AC
  12. 12. A.C generation - Coal
  13. 13. A.C generation - Hydal
  14. 14. A.C generation - Nucleur
  15. 15. Transmission • Power generated in a power station (hundreds of MWatts) is transported over a long distances (hundreds of kilometers) with transmission lines and towers.
  16. 16. Transmission plus distribution