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Electric Circuit - Introduction + Lecture#1

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  • 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. 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. • 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. 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. 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. Overview of electric power 3 main issues pertaining to electric power… • Generation • Transmission • Distribution
  • 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. 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. 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. 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. From DC to AC
  • 12. A.C generation - Coal
  • 13. A.C generation - Hydal
  • 14. A.C generation - Nucleur
  • 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. Transmission plus distribution