Applied Electricity I

At the end of this course, the students should be able to: 1. apply methods from electromagnetic theory and basic physics to the analysis of electrical and electronic systems including electrical power systems; 2. devise lab experiments, collect and analyse data from physical and simulated test systems and use the results to solve technical problems. Also, use lab equipment effectively and safely to measure and analyse electronic and electrical systems, both digital and analogue; 3. design electronic and electrical systems, including electric power systems, to meet or exceed a set of performance specifications, using computational tools and packages; 4. solve common and technical problems in the design of electronics and electrical circuits, including electric power systems and seek specialist advice as needed for more complicated problems; 5. identify the process of innovation and the main factors of entrepreneurship and creative thinking and apply methods of product development; 6. apply project management methods to the planning of projects. Plan, manage and analyse projects using current best-practice methods; and 7. carry out a cost estimate for a design solution and understand the uncertainties associated with the cost estimation process.

DC circuits: definition of electric circuit, linear circuit, non-linear circuit, bilateral circuit, unilateral circuit, dependent source, node, branch, active and passive elements, Kirchhoff’s laws, source equivalence and conversion, network theorems-superposition theorem, Thevenin’s theorem, Norton theorem, maximum power transfer theorem, star-delta conversions. Magnetic circuits: the concept of magnetic circuit, B-H curve, analogous quantities in magnetic and electric circuits, Faraday’s law, iron losses, self and mutual inductance, energy stored in magnetic field. AC single phase circuits: sinusoidal quantities, average and RMS values, peak factor, form factor, phase and phase difference, concept of phasor diagram, V-I relationship in R,L,C circuit, combination R,L,C in AC series, parallel and series parallel circuits with phasor diagrams, impedance and admittance, power factor, power in AC circuit, resonance in RLC series and parallel circuit, Q factor, bandwidth of resonant circuit. Three phase circuits: voltages of three balanced phase system, delta and star connection, relationship between line and phase quantities, phasor diagrams. Power measurement by two-watt meters method. DC machines: construction, basic concepts of winding (lap and wave). DC generator: principle of operation, EMF equation, characteristics (open circuit, load). DC motors: principle of operation, torque equation, speed torque characteristics (shunt and series machine), starting (by 3 point starter), speed control (armature voltage and field control).Single phase transformer: constructional parts, types of transformers, emf equation, no load no load and on load operation, phasor diagram and equivalent circuit, losses of a transformer, open and short circuit tests, regulation and efficiency calculation. Three phase induction motor: types, construction, production of rotating field, principle of operation, slip and frequency, rotor emf and current, equivalent circuit and phasor diagram, torque slip characteristics, torque-speed characteristics, starting of induction motor by star delta starter and( DOL starter). Speed control of three phase induction motor by variation of supply frequency, supply voltage and number of poles. General structure of electrical power system: power generation to distribution through overhead lines and underground cables with single line diagram, earthing of electrical equipment, electrical wiring practice.