# Ppt on three phase ac circuits

##### Chapter 3 Electricity, Components and Circuits. Fundamentals of Electricity When dealing with electricity, what we are referring to is the flow of electrons.

flow of electrons so that you can better operate your radio. Basic Characteristics of Electricity There are three characteristics of electricity: Voltage Current Resistance Basic Characteristics of Electricity Voltage Electromotive force (EMF) causing electrons/kind of resistance to the flow of AC called reactance (X). Reactance also measured in Ohms (Ω). Reactance & Impedance In circuits containing capacitors or inductors, voltage & current are “out of phase”. Current flow changes before the voltage changes/

##### Monday, Apr. 24, 2006PHYS 1444-501, Spring 2006 Dr. Jaehoon Yu 1 PHYS 1444 – Section 501 Lecture #22 Monday, Apr. 24, 2006 Dr. Jaehoon Yu AC Circuit w/

current is The rms current is Monday, Apr. 24, 2006PHYS 1444-501, Spring 2006 Dr. Jaehoon Yu 13 AC Circuit w/ LRC The voltage across each element is –VR –VR in phase with the current –VL –VL leads the current by 90 o –VC –VC lags the current by 90 o/ will not be the simple sum of the three Let’s try to find the total impedance, peak current 00 and the phase difference between 0 0 and V0.V0. Monday, Apr. 24, 2006PHYS 1444-501, Spring 2006 Dr. Jaehoon Yu 14 AC Circuit w/ LRC The current at any instance is/

##### 1 Alternating Current Circuits Chapter 33. 2 Inductance CapacitorResistor.

by The current is (π/2) rad = 90 o out of phase with the voltage 15 Capacitors in AC circuit 16 Capacitors in AC circuit The phasor diagram shows that for a sinusoidally applied voltage, the current/circuit The instantaneous voltage across each of the three circuit elements can be expressed as 22 RLC series circuit In series, voltages add and the instantaneous voltage across all three elements would be  Δv = Δv R + Δv L + Δv C –Easier to use the phasor diagrams 23 RLC series circuit/

##### 1 ELECTRICAL CIRCUIT ET 201  Become familiar with the operation of a three phase generator and the magnitude and phase relationship.  Be able to calculate.

1 ELECTRICAL CIRCUIT ET 201  Become familiar with the operation of a three phase generator and the magnitude and phase relationship.  Be able to calculate the voltages and currents for a three phase Wye and Delta connected generator and load. 2 THREE PHASE SYSTEMS 3 23.1 – Introduction  If the number of coils on the rotor is increased in a specified manner, the result is a polyphase ac generator, which/

##### Vadodara Institute of Engineering kotanbi-391510 Active learning Assignment on Single phase AC CIRCUIT SUBMITTED BY: 1) Bhatiya gaurang.(13ELEE558) 2)

peak-to-peak and rms Capacitive Reactiance magnitude and phase Inductive Reactance magnitude and phase AC Circuits AC Signals and rms Values There are a number of ways to describe the current or voltage for a time varying signal: peak value, peak-to- peak, and rms. Write in your own words what each means and indicate the three values on the sine wave signal shown below/

##### AC Machine CHAPTER 3 EKT 415. AC Machine  Alternating current (ac) is the primary source of electrical energy.  It is less expensive to produce and.

) Or energy is stored in the magnetic field and eventually flows into the electrical circuit that powers the stator – generator Synchronous Machine Construction DC field windings are mounted on the (rotating) rotor - which is thus a rotating electromagnet AC windings are mounted on the (stationary) stator resulting in three-phase AC stator voltages and currents  The main part in the synchronous machines are  i) Rotor/

##### Technology Training that works TRANSFORMERS. Technology Training that works What is a transformer? An electrical equipment used to transform ac voltages.

transformers Used to transfer energy from one AC circuit to another Frequency remains same in both circuits No ideal transformer exists Also used in metering,/Three phase transformers Large scale power generation - Generally 3 phase Requires use of 3 phase step-up and step-down transformers 3 phase transformer - Combination of 3, single- phase transformers (three primary and three secondary windings mounted on a core having three legs) Commonly used configurations: –3 phase three wire (Delta) –3 phase/

##### BASIC ELECTRICAL TECHNOLOGY DET 211/3 Chapter 7 AC Machines Fundamentals & Synchronous Machines.

the dc field current to the machines. A brushless exciter is a small ac generator with its field circuit mounted on the stator and its armature circuit mounted on the rotor shaft. Construction of Three Phase Synchronous Machines (A Brushless Exciter Circuit) A small three phase current is rectified and used to supply the field circuit of the exciter, which is located on the stator. The output of the/

##### Technician License Class Chapter 3 Electricity, Components and Circuits.

special kind of resistance to the flow of AC is called reactance (X).  Reactance also measured in Ohms (Ω). Components  Reactance and Impedance.  In circuits containing capacitors or inductors, voltage & current are “out of phase”.  Current flow changes before the voltage changes/Oscillator B.Potentiometer C.Transistor D.Voltmeter T6B04 -- Which of the following components can be made of three layers of semiconductor material? A.Alternator B.Transistor C.Triode D.Pentagrid converter T6B05 -- Which of /

##### 1 by Prof. Dr. Ali S. Hennache AC Fundamentals ( 08 H ): The Sine wave –Average and RMS values 1H– The J operator – Polar and rectangular forms of complex.

to three decimal places. b.Convert the rectangular coordinates (-3.207, -5.719) to polar coordinates with in degree measure, -180° ˂ ˂ or = 180°, and r ˃ or = 0. 10.Change x² + y² - 4y = 0 to polar form. 28 HOW COMPLEX NUMBERS ARE APPLIED TO AC CIRCUITS Circuit Values Expressed/ between 0° and 90° 3.Which property of a sine wave does the length of a phasor represent? a) Frequency. b) Phase. c) Amplitude. d) Instantaneous value 4.Refer to Fig. 5.5.1: Which of the following statements about Fig 5.5.1/

##### Chapter 33 Alternating Current Circuits. Electrical appliances in the house use alternating current (AC) circuits. If an AC source applies an alternating.

current by 90°. Section 33.5 i and v Phase Relationships – Equations The instantaneous voltage across each of the three circuit elements can be expressed as Section 33.5 More About Voltage in RLC Circuits ΔV R is the maximum voltage across the resistor / when the current begins to decrease in the circuit, the energy is returned to the circuit. The power delivered by an AC circuit depends on the phase. Some applications include using capacitors to shift the phase to heavy motors or other inductive loads so /

##### SUBELEMENT E7 PRACTICAL CIRCUITS [8 Exam Questions - 8 Groups] Practical Circuits1.

power-factor compensation capacitor to create "free power” from the unused portion of the AC cycle 145Practical Circuits E7D17 What is the primary reason that a high- frequency inverter type high-voltage /ohms 231Practical Circuits E7H Oscillators and signal sources types of oscillators; synthesizers and phase-locked loops; direct digital synthesizers 232Practical Circuits 3 styles of Oscillators used in HAM radio 233Practical Circuits Colpitts Hartley Pierce E7H01 What are three oscillator circuits used /

##### Complex Numbers for AC Circuits Topics Covered in Chapter 24 24-1: Positive and Negative Numbers 24-2: The j Operator 24-3: Definition of a Complex Number.

Rectangular Form  24-10: Complex Numbers in Series AC Circuits  24-11: Complex Numbers in Parallel AC Circuits  24-12: Combining Two Complex Branch Impedances  24-13: Combining Complex Branch Currents  24-14: Parallel Circuit with Three Complex Branches McGraw-Hill© 2007 The McGraw-Hill Companies/of the sum of the squares is vector or phasor addition of two terms in quadrature, 90° out of phase.  The phase angle of the resultant is the angle whose tangent is 0.75. This angle equals 37° 24-7: Magnitude/

##### Unit 21 Capacitance in AC Circuits. Objectives: Explain why current appears to flow through a capacitor in an AC circuit. Discuss capacitive reactance.

. Unit 21 Capacitance in AC Circuits Capacitive power phase relationships. Unit 21 Capacitance in AC Circuits Inductive VARs and Capacitive VARs. Unit 21 Capacitance in AC Circuits Frequency Relationships Capacitive reactance (X C ) is inversely proportional to frequency (f). As frequency increases ↑ then capacitive reactance decreases ↓. As frequency decreases ↓ then capacitive reactance increases ↑. Unit 21 Capacitance in AC Circuits Solving a sample series capacitor circuit: Three capacitors (10µF, 30/

##### Grounding and Jumpering

alternating current electric system. 1888, Nikola Tesla demonstrated the first “polyphase” alternating current (AC) electrical system. His AC system includes everything needed for electricity production and use such as the electric generator, /circuit at the work site, double-point grounding must be used. Single Point Grounding Phase Conductor Jumpers Ground Jumper Neutral Jumper Cluster Bar (chain binder) below working position Jumpers connect all three phases together. Jumper connects cluster bar to phases/

##### The X-Ray Circuit.

to ground to protect operator from being electrocuted) mAs meter is used for very short exposures 3) Rectifier Purpose – converts AC to DC to prevent reverse bias Location – Between secondary of step-up transformer and x-ray tube 4) Cables to x/ 12 rectifiers or 12 pulses with 12 rectifiers (3 Ǿ, 6 p = 13% ripple, 3 Ǿ 12 p = 3% ripple Three Phase Generator Circuits To work properly must have 3 primary & secondary windings in transformer (one for each current) Must have 3 autotransformers (one for each/

##### electronics fundamentals

in series, the total capacitive reactance is the sum of the individual reactances. Assume three 0.033 mF capacitors are in series with a 2.5 kHz ac source. What is the total reactance? The reactance of each capacitor is 5.79 /phase. No true power is dissipated by a capacitor, because stored energy is returned to the circuit. The rate at which a capacitor stores or returns energy is called reactive power. The unit for reactive power is the VAR (volt-ampere reactive). Rectifiers Convert a sinusoidal wave (ac/

##### © 2003-2009 Ran Ginosar048878 Lecture 4: Speed-Independent Control Circuits 1 VLSI Architectures 048878 Lecture 4 S&F Ch. 6: Speed-Independent Control.

© 2003-2009 Ran Ginosar048878 Lecture 4: Speed-Independent Control Circuits 78 a0+ a1+ r0+ A+ rCf+ rCt+ aC- r1+ R+ Input Free Choice P3P1 aC+ P2 rCf- rCt- P4P4 r0-r0- r1-r1/three solutions. Decide which three comparison criteria to use © 2003-2009 Ran Ginosar048878 Lecture 4: Speed-Independent Control Circuits 95 Data Validity © 2003-2009 Ran Ginosar048878 Lecture 4: Speed-Independent Control Circuits 96 Four Channel Types © 2003-2009 Ran Ginosar048878 Lecture 4: Speed-Independent Control Circuits 97 2 phase/

##### 1 Chapter 1. Three-Phase System. 1.1: Review of Single-Phase System The Sinusoidal voltage v 1 (t) = V m sin  t i v1v1 Load AC generator v2v2 2.

EYEY EBEB ZRZR IYIY IBIB ZBZB ZYZY VBVB ININ ZNZN VNVN 3-wire system (no neutral line ) ERER Three-phase Load Three-phase AC generator VYVY IRIR VRVR EYEY EBEB ZRZR IYIY IBIB ZBZB ZYZY VBVB VNVN 3-wire system (no neutral line ) No neutral line = open circuit, Z N = ∞ 43 44 VNVN = ERER ZRZR + EYEY ZYZY + EBEB ZBZB 1 ZNZN + 1 ZRZR + 1 ZYZY + 1/

##### Copyright R. Janow – Spring 2015 Electricity and Magnetism Lecture 13 - Physics 121 Electromagnetic Oscillations in LC & LCR Circuits, Y&F Chapter 30,

circuits Mechanical Harmonic Oscillator LC Circuit Oscillations Damped Oscillations in an LCR Circuit AC Circuits, Phasors, Forced Oscillations Phase Relations for Current and Voltage in Simple Resistive, Capacitive, Inductive Circuits. Summary Copyright R. Janow – Spring 2015 LC and RC circuits with constant EMF - Time dependent effects R C E R L E Growth Phase Decay Phase Now LCR in same circuit/– 3: The three LC circuits below have identical inductors and capacitors. Order the circuits according to their /

##### Gear for switching CIRCUIT BREAKERS ISOLATORS

C/S 240 Volts xxii) a) Rated supply voltage of (closing and operating devices and auxiliary circuits ~ 1)1 10 y dc/so vdc 2) 240 Volts AC 50 C/S single phase 3) 415 Volts 50 Hz three phase b) Permissible voltage variation 1) m case of DC Power supply voltage 11 variation shall be between 85% to 1 10% 1 of normal voltage/

##### Technical Training _Embroidery machine control parts

XY Driver’s circiuit 3) Input circuit of Motor Driving power circuit content it designs based 3-phase, but now small head is using one-phase, so only 1,2 line is using. it’s changed from AC 220V to Motor Driving DC 310V. 3. Circuit Interaction # XY Driver Board 4. Understanding/-state 74HC244; 74HCT244　 3-state buffer of 8Bit This(IC) is depend on 1th (ENA) and 19th (ENB)’s spec, and the three kind of output can come out When 1th and 19th is LOW, the input don’t reverse and the value is output. When 1th and/

##### Chapter 12 Three Phase Circuits

not require a special design or additional starting circuitry. Single Phase, Three phase Circuits b) Single phase systems three-wire type. Allows connection to both 120 V and 240 V. a) Single phase systems two-wire type Two-phase three-wire system. The AC sources operate at different phases. Three-phase Generator The three-phase generator has three induction coils placed 120° apart on the stator. The three coils have an equal number of turns, the voltage/

##### Chapter 4 AC to AC Converters Outline 4.1 AC voltage controllers 4.2 Other AC controllers 4.3 Thyristor cycloconverters 4.4 Matrix converters.

equation The RMS value of output voltage, output current, and thyristor current can then be calculated. 4.1.2 Three-phase AC voltage controller Classification of three- phase circuits 3- phase 3- wire Y connection AC voltage controller For a time instant, there are 2 possible conduction states: – Each phase has a thyristor conducting. Load voltages are the same as the source voltages. – There are only 2 thyristors conducting/

##### Amateur Extra Licensing Class Lake Area Radio Klub Spring 2012 Circuits & Resonance for All!

is that toroidal cores contain most of the magnetic field within the core material. Amateur Radio Extra Class Circuits & Resonance for All! E6D13… Forty three turns of wire will be required to produce a 1-mH inductor using a ferrite toroidal core that has/the formation of inductive and capacitive fields E5D11 How can the true power be determined in an AC circuit where the voltage and current are out of phase? A.By multiplying the apparent power times the power factor B.By dividing the reactive power /

##### Alternating Current Circuits and Electromagnetic Waves Chapter 21.

in DC circuits Ohm’s Law for a resistor, R, in an AC circuit ΔV R,rms = I rms R The same formula applies to the maximum values of v and i Chapter 21 Problem 4 The figure shows three lamps connected to a 120-V AC (rms) household/ = I max Z This can be regarded as a generalized form of Ohm’s Law applied to a series AC circuit Summary of Circuit Elements, Impedance and Phase Angles Problem Solving for AC Circuits Calculate as many unknown quantities as possible (e.g., find X L and X C ) Be careful with units/

##### Alternating Current Circuits and Electromagnetic Waves Chapter 21.

in DC circuits Ohm’s Law for a resistor, R, in an AC circuit ΔV R,rms = I rms R The same formula applies to the maximum values of v and i Chapter 21 Problem 4 The figure shows three lamps connected to a 120-V AC (rms) household/ = I max Z This can be regarded as a generalized form of Ohm’s Law applied to a series AC circuit Summary of Circuit Elements, Impedance and Phase Angles Problem Solving for AC Circuits Calculate as many unknown quantities as possible (e.g., find X L and X C ) Be careful with units/

##### 10 Lecture in physics Projects Magnetism LRC circuit Electromagnetic waves Optics.

responsible for the common phenomena of magnetism encountered in everyday life. Substances respond weakly to magnetic fields with three other types of magnetism, paramagnetism, diamagnetism, and antiferromagnetism, but the forces are usually so weak that / to the current in an alternating current (AC) circuit. Impedance extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude. When a circuit is driven with direct current (DC), there/

##### A presentation of eSyst.org Electrical Power Distribution An AC System Louis E. Frenzel.

DC generator. A presentation of eSyst.org AC Generator Figure 2 3-Phase Voltages Fig. 3 shows the three sine wave voltages produced by the generator. There is a 120 degree time difference between the three sine wave outputs. A presentation of eSyst.org/current exceeds the rated current value, the electromagnet has sufficient pull to disengage the switch turning off the voltage to that circuit. Circuit breakers are available in current ratings of 15, 20, 30 and 40 amperes. Large breakers of 100 to 200 amps/

##### CHAPTER 5.  Bridge circuit (DC or AC) is an instrument to measure resistance, inductance, capacitance and impedance.  Operate on a null-indication principle.

= 1.5 kΩ R3 = 3 kΩ R4 = 7.8 kΩ R g = 150 Ω Slightly Unbalanced Wheatstone Bridge If three of the four resistors in a Wheatstone bridge are equal to R and the fourth differs by 5% or less, we can develop/. Fig 5.13: General AC bridge circuit The usefulness of AC bridge circuit is not restricted to the measurement of an unknown impedance. These circuits find other application in many communication systems and complex electronic circuits, such as for: shifting phase, providing feedback paths for oscillators/

##### Synchronous Machines. Synchronous generators or alternators are used to convert mechanical power derived from steam, gas, or hydraulic-turbine to ac electric.

industrial drives Construction  Basic parts of a synchronous generator: Rotor - dc excited winding Stator - 3-phase winding in which the ac emf is generated  The manner in which the active parts of a synchronous machine are cooled determines its/ PF: |V t |>|E f | for underexcited condition Three-phase equivalent circuit of a cylindrical-rotor synchronous machine The voltages and currents of the three phases are 120 o apart in angle, but otherwise the three phases are identical. + I a1 E f1 jX s RaRa /

##### AC DRIVES There are two type of AC motor Drives :

AC motor Drives : Induction Motor Drives Synchronous Motor Drives INDUCTION MOTOR DRIVES Three-phase induction motor are commonly used in adjustable-speed drives (ASD). Basic part of three-phase induction motor : Stator Rotor Air gap The stator winding are supplied with balanced three-phase AC/. The efficiency. The power factor of input line of the motor. The equivalent circuit : The dc voltage at the rectifier output is : and For a three-phase rectifier, relates Er and Vd as : Using : If Pr is the slip /

##### RL-RC Circuits & Applications SVES Circuits Theory

for the same reason indicated for a resistive element. 5 Inductive ac circuit. Inductive ac circuit Voltage is 24 volts Peak Inductor Waveforms for Example voltage leads the current by 90 degrees Phasor diagrams for Example. 24.0 V 8.0 Three cases of impedance R – C series circuit Illustration of sinusoidal response with general phase relationships of VR, VC, and I relative to the source voltage/

##### Three Phase Controlled Rectifiers

Three Phase Controlled Rectifiers Power Electronics Three Phase Controlled Rectifiers 1 3 Phase Controlled Rectifiers Power Electronics 3 Phase Controlled Rectifiers Operate from 3 phase ac supply voltage. They provide higher dc output voltage. Higher dc output power/in the Inversion mode Vdc is negative, Idc is positive and the average load power Pdc is negative. Power flows from load circuit to ac source. 85 When the converter 2 is switched on, Power Electronics When the converter 2 is switched on, For 2 /

##### Review of 1- AC Circuit Fundamentals

the rms current flowing through the reristor times the resistor (ignore phase angle)) Series Resonance occurs when is maximum in this case Transformer Review of 1- AC Circuit Fundamentals(3) Parallel RLC circuit Parallel Resonance occurs when is minimum in this case Transformer The Transformer/ and Example Explained and worked out on Greenboard Transformer Review of balanced three phase circuits Two possible configurations: Star (Y) and delta () Star has neutral, delta does not Transformer Star (Y) connection /

##### Lesson 34 3 PHASE Sources & Loads. Learning Objectives Review the induced AC voltage output for a three phase AC generator as a function of time and as.

a three phase AC generator as a function of time and as phasors. Define a three-wire Y-Y three phase circuit and a four-wire Y-Y three phase circuit. Define the symbols for line to neutral voltages, line to line voltages, line currents, and phase impedances that will be used in three phase circuits. Analyze Ohm’s law in a three-wire Y-Y three phase circuit and in a four- wire YY three phase circuit using a basic three phase/

##### electronics fundamentals

-up transformer - Rpri RL Matching Transformers Impedance (Z) Opposition to current flow in ac circuits Impedance matching Used to show that the source and load resistances are the same Impedance matching/winding transformers Three-phase transformers Three-phase power is used for power transmission and industrial applications. Voltages in a three-phase system can be transformed with three identical single phase transformers or one three-phase transformer. Three-phase transformers Three-phase transformers /

##### Storey: Electrical & Electronic Systems © Pearson Education Limited 2004 OHT 16.1 Power in AC Circuits  Introduction  Power in Resistive Components 

Storey: Electrical & Electronic Systems © Pearson Education Limited 2004 OHT 16.1 Power in AC Circuits  Introduction  Power in Resistive Components  Power in Capacitors  Power in Inductors  Circuits with Resistance and Reactance  Active and Reactive Power  Power Factor Correction  Power Transfer  Three-Phase Systems  Power Measurement Chapter 16 Storey: Electrical & Electronic Systems © Pearson Education Limited 2004 OHT 16.2 Introduction  The instantaneous power dissipated in a component/

##### 指導教授:龔應時 研究生:曾琮峻 學號:MA320107

) 10Hz (b) 20Hz Experimental waveforms (1A / 100mV) Conclusion The FPGA-based digital SPWM AC induction motor control IC‘s designed to drive AC induction motor, In the digital control circuit part of its internal architecture consists of a triangular wave generator counter, a three-phase sinusoidal command produces check value table, the three-phase sinusoidal command after comparison with the triangular wave generated trigger signal via a/

##### ACADs (08-006) Covered Keywords Switching power supply, amplifier, logic, digital, circuit, solid state. Description Supporting Material 5.1.12.1.12e5.4.1.15.4.1.2.

Circuit symbol and device cross-section of a) a Diode AC switch (DIAC) and a Triode AC switch (TRIAC FET: Field-effect transistor s The JFET is a class of Unipolar semiconductor device which comes in two basic varieties, n or p channel. The device in general `runs in the depletion mode with three/ Relationships A. Basic Operation of the Non-Inverting Amplifier Circuit has Hi Zin, Low Zo, and no phase inversion. “Golden Rule” : In a feedback circuit the summing junction Value is driven to equal the reference/

##### Power Electronic Drives - DC to AC converter / Inverter

ac side to the dc side Two types of inverters: single-phase inverters and three-phase inverters Systems Engineering School of Electrical ABD RAHIM 2008 Switch-Mode DC-AC Inverters Applications: ac motor drives Uninterruptible ac power supplies Where a sinusoidal ac / through load when two device in same leg conduct – IL is bypassed from load (buck-bost regulator circuit) Systems Engineering School of Electrical ABD RAHIM 2008 Current source inverters Systems Engineering School of Electrical when two device/

##### OUTPUT EQUATION OF SINGLE PHASE TRANSFORMER · The equation which relates the rated kVA output of a transformer to the area of core and window is called.

phase is equal to secondary ampere turns per phase. · Total copper area in window, Ac = (2 x Number of primary turns x area of cross-section of primary conductor) + ( 2 x Number of secondary turns x area of cross - section of secondary conductor) · On equating we get, · The kVA rating of three phase/ is extremely important as a component in many different types of electric circuits, from small-signal electronic circuits to high voltage power transmission systems. · The most important function performed/

##### 1 Electronic Circuits OSCILLATORS. 2 Electronic Circuits The term oscillator naturally implies an oscillating or revolving motion. One example of mechanical.

inductor in the form of alternating voltage and current 90 degrees out of phase with each other. 10 Electronic Circuits When the power supply frequency for an AC circuit exactly matches that circuits natural oscillation frequency as set by the L and C components, a / to both sides of a crystal a potential of difference is developed. CRYSTALL OSCILLATOR 17 Electronic Circuits The three most popular crystal materials are; 1.Rochelle salt: Has the weakest crystal structure 2.Tourmaline:Has the least electrical /

##### Chapter 36 Viewgraphs AC Circuits. Most currents and voltages vary in time. The presence of circuit elements like capacitors and inductors complicates.

AC Circuits Most currents and voltages vary in time. The presence of circuit elements like capacitors and inductors complicates the relation between currents and voltage when these depend on time. Resistive element -I&V proportional Reactive elements involves derivatives Voltage and current are not simply proportional for reactive elements. Ohm’s law does not apply. Introduction Three/both R and L Inductor Voltage Inductor voltage is 90 degrees out of phase with resistor voltage and current V L (t) I(t) t /

##### Copyright © 2009 Pearson Education, Inc. Chapter 30 Inductance, Electromagnetic Oscillations, and AC Circuits.

30-6 LC Oscillations with Resistance ( LRC Circuit) The system will be underdamped for R 2 4L/C. Critical damping will occur when R 2 = 4L/C. This figure shows the three cases of underdamping, overdamping, and critical /the circuit nonoscillating? Copyright © 2009 Pearson Education, Inc. Resistors, capacitors, and inductors have different phase relationships between current and voltage when placed in an ac circuit. The current through a resistor is in phase with the voltage. 30-7 AC Circuits with AC Source/

##### FOWLER CHAPTER 9 LECTURE 9 POWER IN AC CIRCUITS. POWER IN RESISTIVE CIRCUITS, CHAP 9 WITH A RESISTIVE LOAD, CURRENT AND VOLTAGE ARE IN PHASE. F.9.1 THIS.

100% effective power utilization. AC Volts x AC Amps = VA (Volt Amp) Purely Resistive AC Load: VA = Watts (same as DC circuits) Inductive/Reactive AC Load: VA x PF = Watts AC Volts x AC Amps x PF = Watts A Power Factor of 0.75, means that an installation is using 75% of the power being supplied to it. Aerovox manufactures both single and three-phase power factor correction capacitors/

##### ECE 2300 Circuit Analysis Dr. Dave Shattuck Associate Professor, ECE Dept. Lecture Set #20 Phasors 713 743-4422 W326-D3.

AC Circuits – Background Concepts Overview of this Part AC Circuits – Background Concepts In this part, we will cover the following topics: Introduction to AC Circuit/Circuits by A. Bruce Carlson, shows a generalized sinusoid. Note that the phase, , represents the time shift to the left along the time axis, after dividing by . The phase has angular units, usually either radians or degrees. Some Review – Sinusoids – 4 A general sinusoid has the following equation. Note that in this equation there are three/

##### Wednesday, Apr. 18, 2012PHYS 1444-004, Spring 2012 Dr. Jaehoon Yu 1 PHYS 1444 – Section 004 Lecture #21 Wednesday, April 18, 2012 Dr. Jaehoon Yu AC Circuit.

current is The rms current is Wednesday, Apr. 18, 2012PHYS 1444-004, Spring 2012 Dr. Jaehoon Yu 10 AC Circuit w/ LRC The voltage across each element is –VR –VR in phase with the current –VL –VL leads the current by 90 o –VC –VC lags the current by 90 /will not be the simple sum of the three Let’s try to find the total impedance, peak current 00 and the phase difference between 0 0 and V0.V0. Wednesday, Apr. 18, 2012PHYS 1444-004, Spring 2012 Dr. Jaehoon Yu 11 AC Circuit w/ LRC The current at any instance/

##### Chapter 30 Inductance, Electromagnetic Oscillations, and AC Circuits.

AC Circuit Copyright © 2009 Pearson Education, Inc. 30-8 LRC Series AC Circuit The phase angle between the voltage and the current is given by The factor cos φ is called the power factor of the circuit. or Copyright © 2009 Pearson Education, Inc. 30-8 LRC Series AC Circuit Example 30-11: LRC circuit/Energy Transported by Waves Copyright © 2009 Pearson Education, Inc. If a wave is able to spread out three- dimensionally from its source, and the medium is uniform, the wave is spherical. Just from geometrical /

##### Microelectronic Circuits SJTU Yang Hua Chapter 8 Feedback Introduction 8.1 The general feedback structure 8.2 Some properties of negative feedback 8.3.

amplifier oscillation. SJTU Yang HuaMicroelectronic Circuits Three Parts: PartI: The basic concept/Circuits AC feedback ， no DC feedback DC feedback ， no AC feedback The judgment of DC feedback and AC feedback SJTU Yang HuaMicroelectronic Circuits Example ： feedback ？ Positive or negative ？ DC or ACAC and DC negative feedback SJTU Yang HuaMicroelectronic Circuits/ using bode plot SJTU Yang HuaMicroelectronic Circuits Balance condition: Magnitude condition: Phase Condition: Start up oscillation condition: /