The voltage across the inductor is given as vl which is the same as v. The modules listed in the overview are linked to the corresponding pages. Iare ac machines page 1 lecture notes on ac machines 2018 2019 ii b. Alternating current circuits and electromagnetic waves outline 21. Using ohms law, we can write the following relations. Ac circuit with a pure resistance consider an ac circuit with a pure resistance r as shown in the figure. The voltage across the resistor is given as v r which is the same as v.
That is the ac supply voltage is chopped using thyristorstriac during a part of each input cycle. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Circuits can be classified according to the type of current they carry see alternating current, direct current or according to whether the current remains whole series or divides to flow through several branches simultaneously parallel. Find the thevenin equivalent circuit of the circuit shown below, to the left of the terminals ab. Basic ideas our development of the principles of circuit analysis in circuit analysis i was in terms of dc circuits in which the currents and voltages were constant and so did not vary with time. C is the current that changes in magnitude direction continuously with respect to time. Ee301 ac seriesparallel circuits 1 1052016 x x tot z ve z eq xtot x z ii z learning objectives a. Alternating current fundamentals and ac generation rms value, average value, form factor and crisp factor phasorconcept relation between voltage and current in resistor, capacitor and inductor response of rl and rc circuits. An alternating current ac is a current that varies sinusoidally with time. Half controlled and fully controlled bridge circuits, different. Irfan ahmad pindoo quick quiz poll the value of power factor ranges.
Scotthughes 14april2005 massachusetts institute of technology department of physics 8. The most common periodic voltage is in the form of a sine or cosine wave. Describe, with diagrams and equations, the phase relationships for circuits containing resistance, capacitance, and inductance. Well learn that ohms law and the power equations are valid for sources that vary not o. Then the two equations of are the same as the ones we would get from the circuit of fig. We encounter ac circuits whenever a periodic voltage is applied to a circuit. This section contains lecture notes from the fall 2000 version of the course.
There are two major advantages of threephase systems over a singlephase system. The circuit diagram for obtaining static vi characteristics is as shown. Ee301 ac seriesparallel circuits learning objectives. Power in ac circuits ipower formula irewrite using icos. Pa ei voltampere reactive var power is the the vertical component of product of e and. Chapter 12 alternatingcurrent circuits mit opencourseware. Oday a ahmed 7 ac phase control choppers in phase control the thyristors are used as switches to connect the load circuit to the input ac supply, for a part of every input cycle. Phys102 ac circuits phasors slide 3 properties of inductive reactance the reactance for an inductor describes the behavior of a inductor placed in a circuit with a timevarying voltage source. Replacing all capacitors by a short circuit equivalent 3.
Alternating current fundamentals and ac generation rms value, average value, form factor and crisp factor phasorconcept relation between voltage and current in resistor, capacitor and inductor response of rl and rc circuits sinusoidal response of rlc circuit series resonance course contents. L is large so the inductor offers greater resistance to current. Most of the time, we are interested in the voltage at a point in the circuit. Using ohms law, we can write the following relations 2 where. Singlephase midpoint and bridge types of stepup and stepdown. The frequency in hertz hz is shown for various musical notes.
Three phase emf generation, delta and star connection, line and phase quantities. Ac circuits ac alternating current dc direct current i. Determine total impedance of ac parallel and series circuits b. Rlc ac circuits volts period vo amplitudevo ac alternative current. A dc source is a special case of a cosine wave with. Describe, with diagrams and equations, the phase relationships for circuits containing resistance, capacitance, and.
Connection types there are two types of connections in threephase circuits. Phase quantities voltages and currents in a given phase. Imperial college london dyson school of design engineering. Circuits with resistors, capacitors, and inductors are covered, both analytically and experimentally. Amplitude and phase relations phasor diagrams for voltage and current impedance and phasors for impedance resonance power in ac circuits, power factor examples transformers summaries. Introduction to ac circuit analysis full lecture youtube. For two sine waves, the leading one reaches its peak. In this lesson well introduce basic ac circuit analysis techniques. K devender reddy,assistant professor department of electrical and electronics engineering institute of aeronautical engineering autonomous dundigal, hyderabad 500 043. We will now extend this analysis to consider time varying currents and voltages. It can be represented as, the currents and voltages in a. Ac circuits 3 solving for the current and using eq.
A threephase ac system consists of threephase generators, transmission lines, and loads. Describe the sinusoidal variation in ac current and voltage, and calculate their effective values. The alternating voltage v is given by 1 the current flowing in the circuit is i. These notes can also be found in the video lectures section, under the related resources tab for each video. Teach yourself electricity and electronics, mcgrawhill, chapters 15 voltagecurrent profiles of l, c, rl, rc and circuits impedance of rl, rc and rlc circuits. Two basic laws that describe the performance of electric circuits are ohms law and kirchhoffs circuit. Lecture notes on power electronics subject code bee1602 6th semester b. Doehdbk10192 june 1992 doe fundamentals handbook electrical science volume 3 of 4 u. It is the current or voltage that in the circuit at any instant. Delta each generator and each load can be either yor. Ohms law kirchoffs laws dc and ac circuits resistors in series and parallel circuits meshcurrent and node voltage method of analysis for d. This module presents power calculations for singlephase and threephase ac circuits and includes the power triangle concept. Ac circuit presentation solutions ac circuits lecture notes all electric machines lectures lecture notes, lectures 16 measurement systems exam 2015, questions and answers mid sessional exam 2016, questions and answers. This course explains how to analyze circuits that have alternating current ac voltage or current sources.
Described briefly about rl series circuit and also solved various types of problem of this circuit in bangla. Ac circuits merced college 5 phys04b rlc series circuits with ac resistor, inductor, and capacitor may appear in any order follows same trend as with dc circuits instantaneous current through each element is the same. In particular, if a coil rotates in the presence of a magnetic field, the induced emf varies sinusoidally with time and leads to an alternating current ac, and provides a source of ac. Ashok babu, professor v r seshagiri rao, professor. Line quantities voltages between the lines and currents in the lines connected. Apply ohms law, kirchhoffs voltage law, voltage divider rule, kirchhoffs current law, and current divider rule to ac series parallel networks and its elements. The interconnection of various electric elements in a prescribed manner comprises as. Lessons in electric circuits, volume ii ac ibiblio. The emphasis of this course if laid on the basic analysis of circuits which includes network analysis, 1phase ac circuits, magnetic circuits. Ahmad elbanna 2014 j6011448 electronic principals integrated technical education cluster at alameeria.
Subject basic electrical engineeringtopic syllabus overview of single phase ac circuits lecture 08faculty ranjan raigate academy plus is an eff. An rl circuit is driven by an ac generator as shown in the. Current is always measured through a circuit element as shown in fig. As mentioned in lecture 15, we use induction to generate the vast majority of electrical. We can find the current through the inductor as follows 2 where tvv m. Such current is used in your household to run the air conditioner, refrigerator, washing machine, and other electric appliances. Lecture notes institute of aeronautical engineering.
Some practical applications in sensors are demonstrated. In phase means that both waveforms peak at the same time. Ac circuit with a pure inductance consider an ac circuit with a pure inductance l as shown in the figure. An rl circuit is driven by an ac generator as shown in the figure. Setting all dc sources to zero and replacing them by a short circuit equivalent 2. J srinu naick, professor chadalawada ramanamma engineering college autonomous chadalawada nagar, renigunta road, tirupati 517 506. Physics 121 electricity and magnetism lecture 14 ac.
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