802307Electrical Engineeringfor Mechinacal Engineers Electrical Engineering department Umm Al-Qura University Dr. Basim J. Zafar
This Course … • Applications of Electrical Engineeringin Different Systems.. • Concepts and Basics of Electricity and Electronics.. • Practical Engineering Applications..
Course Content • History of Electricity • Basic Concepts • electrons, battery, DC&AC, frequency, closed loop, current, RMS • Components • R, C, L, fuses, breakers, relays, solenoids, diodes, transistors, ICs
Course Content • Circuit Analysis • ohms law, dividers, KCL, KVL, complex impedance, current source, power • Application Specific Circuits • Power Generation and Distribution • DC machines, transformers, 3-phase systems
Course Content • Sensors & Actuators • resistive, capacitive, inductive • special sensors • data acquisition
Class Format • Active Class • Teams of 2 students • Weekly Quiz (no makeup's) • Weekly Activities • In-Class Readings
Rules • Quizzes • grades 0 or 10 • be ON-TIME • absence = -2 • no material on table • calculator & pencil • 2 decimal points with proper units • cheating = BIG TROUBLE
Rules • Activities • team ID + members IDs • nice fonts and presentation • members loads must be equal • Teamwork • any conflict should be stated from the beginning
Grades • Quizzes / Class Activities 10% • Mid Term Exams I 15% • Mid Term Exams II 15% • Final 40% • Lab 20%
Students ID’s • EE307 Sections • IDs in Teams: • Team A: A1 – A2. • Team B: B1 – B2. • Team C: C1 – C2. • Team D: D1 – D2. • Team E: E1 – E2.
http://uqu.edu.sa/bjzafarE-mailBJZafar@uqu.edu.sa Class homepage
Introduction Section 01
History of Electricity • Ancient Egyptian 2750 BC • shocks from electric fish
History of Electricity • Romans 1500 BC • shocks can travel in metals • Thales 600 BC • Noticed static electricity from polishing amber with a piece of wool or fur. • Arabs 1400 • Identity of lightening • William Gilbert 1600 • Coined the New Latin word electricus to refer to the property of attracting small objects after being rubbed
History of Electricity • Benjamin Franklin 1753 • lightening key experiment • Luigi Galvani 1771-1791 • nerve cells passed signals to the muscles • Alessandro Volta 1800 • invented the voltaic pile consist of Zinc and silver. • Hans Christian Ørsted 1819 • demonstrates electromagnetism. Current flowing in a wire creates a magnetic field which deflects a compass needle.
History of Electricity • André-Marie Ampère 1820 • Figures out a way to measure the strength of a magneticfield in relation to an electriccurrent, known as Ampere’stheorem. • Michael Faraday 1831 • learned how to produce continuous voltage. |This was the first electric motor (generator). • Georg Ohm 1827 • mathematically analyzed the electrical circuit (ohm's law) • Tesla, Edison, Westinghouse, Siemens, 1900’s Graham Bell and Kelvin • Electricity was turned from a scientific curiosity into an essential tool for modern life (Second Industrial Revolution)
ExoMars Mission Life in other planets!
ExoMars Mission • landing of a large payload on Mars • navigation and operation of a mobile scientific platform • a novel drill to obtain subsurface samples • sample processing and distribution system • protection and cleanliness levels
Process Check, Home Work • Ask yourself.. • What do I need to know about EE?
Basic Concepts Section 02
Electrons • Atoms and Electrons
Electricity • If electrons were pushed, they produce a current
Battery • Source of pushing electrons • Electrochemical reactions • Look for types of batteries in Wikipedia!! Home Work
Volt • Alexander Volta (first battery) • Electromotive Force • 1.5V, 110V, 13.8kV
Current • Number of electrons passing every second • Ampere (A) is a unit of current • 1 A = 6.28 x 1018 electrons/sec • At home: 60A,100A • Electronics: 10mA
AC and DC Currents • DC: direct current • AC: alternating current volt volt time time
Frequency of AC Signal volt volt time time • Frequency = Number of cycles per second
Experiment!! • What’s the highest frequency your eyes can notice? • frequency vs. amplitude.. • 790–400 terahertz – light
Closed Loop Circuits • No current will flow in an open loop circuit..
Closed Loop Circuits • Electric Circuit is a pipeline that facilitates the transfer of charge from one point to another
Power • Power is the time rate of change of energy • Unit: watts (W) • P=VI
Elements supplying Energy vs. Elements absorbing Energy • An element in the electric circuit is absorbing energy if +ve current enters the +ve terminal • An element in the electric circuit is supplying energy if +ve current enters the -veterminal
Ground Currents • Why birds do not get shocked by high voltage lines? • How do you charge a weak car battery?
Activity • Determine the amount of power absorbed or supplied by the elements in the figure? I = 2 A V1= 4 V 4 V
Activity • Determine the amount of power absorbed or supplied by the elements in the figure? V1= 12 V 12 V I = 4 A
AC Source • Generally produces sine wave
RMS • RMS: Root Mean Square • power is measured instead of peak voltage • for sine or cosine signals, v(t) = A cos(2pt/T)
RMS • If your meter reads 10V~ • then vpeak = 10*1.4 = 14V • If your peak voltage is 154Vp • then the meter reads RMS = 154*0.7 = 110V~
More Readings Basic Engineering Circuit Analysis By J. D. Irwin and R. M. Nelms John Wiley & Sons, 2005 or newer edition