## Course: Electrical Circuits Ι

Course Code: ΜΚ18-H
Course Level: Undergratuate
Obligatory/Elective: Elective
Semester: 2
Division: Main Course
Group: Main Course
ECTS Credits: 5
Hours Per Week: 5
Website: eclass.uowm.gr/courses/ECE373/
Language: Greek
Content:
1. Electrical quantities and circuit elements: International System of Units (SI), voltage and current, power and energy, voltage and current sources, electrical resistance (Ohm’s law), Kirchhoff’s laws, analysis of a circuit that contains dependent sources.
2. Simple ohmic elements: Resistors in series and parallel, voltage divider circuits, voltage and current measurement, resistance measurement–Wheatstone bridge, equivalence of triangle with star circuits (Δ-to-Υ).
3. Techniques for circuit analysis: Method of voltage nodes with independent and/or dependent sources and special cases, method of current loops with independent and/or dependent sources and special cases, comparison of the two methods.
4. Self-inductance, capacitance: Series and parallel combinations of inductances and capacitances, mutual inductance.
5. First order circuits RL and RC: Natural and step response, the general solution for step and natural responses, Sequential Switches.
6. Natural and step response of RLC circuits: Natural response of parallel RLC circuit, response formats, sub-, normal and hyper-damping, step response of parallel RLC circuit, natural and step response of series RLC circuit.
7. Circuit analysis in the permanent sinusoidal condition (PSC): sinusoidal source and response, phasor, passive circuit elements in the frequency field, Kirchhoff laws in the frequency field, connection simplifications in series, parallel and triangle- star, source transformations and equivalent Thévenin and Norton circuits, node voltage methods and current loops at PSC, ideal transformer, phasor diagrams.
Learning Outcomes:

At successful end of the course the student will be able to:

• understand, use and convert SI and empirical units in electric circuits,
• calculate the power for every element of a simple circuit,
• recognize series or parallel connections of resistors and calculate the total resistance,
• use voltage divider and current divider to solve simple circuits,
• analyze a Wheatstone bridge and use it to measure an unknown resistance,
• use Δ – Y transformation to solve simple circuits,
• use the method of voltage nodes and the method of current loops to solve a circuit,
• judge which method is preferable for each circuit,
• understand the source transformation and be able to use it for solving a circuit,
• understand the meaning of and be able to solve the equivalent Thevenin and Norton circuits of a complex circuit,
• understand and estimate the value of the load which satisfies the condition for maximum power transfer,
• know and be able to use the equations for the voltage, current, power and energy in an inductive coil or a capacitor as well as in parallel or serial combinations of such,
• understand of the concept of the mutual inductance and be able to use the dot convention to form the current loop equations for a circuit that contains magnetically coupled coils,
• calculate the transitional response of RL and RC circuits as well as their response in step excitation,
• be able to analyze a circuit with successive switching function,
• calculate the transitional response and the response to step excitation of parallel and series RLC circuits,
• understand the concept of a phasor and be able to use it to transform a circuit with sinusoidal voltage source in the frequency field,
• be able to use all the circuit analysis techniques (Kirchhoff’s laws, series, parallel and Δ - Υ simplifications, voltage and current dividers, Thevenin και Norton equivalents, voltage node methods and current loop methods) and solve a circuit in the frequency field,
• be able to analyze circuits that contain transformers using phasor methods.
Pre-requirements:

None

Teaching Methods:
 Method Description Semester Workload Lectures 50 Tutorial exercises 25 Laboratory exercise 50 Total 125
Validation:

• Three written progress exams (25%)
• Final written problem-solving exam (35%)
• Weekly laboratory assessments with final written report
(40%)

Suggested Books:
1. Nilsson/Riedel “ELECTRIC CIRCUITS” 9th Edition, Testator (Publisher): GRIGORIOS CHRYSOSTOMOU FOUNTAS, Book code in EUDOXUS: 50657746
2. Papadopoulos K. “Analysis of Electric circuits” 2nd Edition, Testator (Publisher): TSOTRAS AN ATHANASIOS, Book code in EUDOXUS: 68374128
3. Alexander C., Sadiku M. “Electric circuits” 4th Edition, Testator (Publisher): A. Tziola & Sons Ltd Publications, Book code in EUDOXUS: 18548946
Lecturer: Poulakis Nikolaos