A series circuit containing r, l, and c is in resonance when the current in the circuit is in phase with the total voltage across the circuit. Series lc resonant circuit with resistance in parallel with c. Resonance in series and parallel rlc networks electrical and. Experiments in physics series and parallel resonant. The bandwidth for parallel circuits is the frequency range between frequencies where the power is twice the power at resonance.
Provide the annotated data for each one along with the answers to any questions. A series resonant circuit has the capability to draw heavy current and power from the mains. Video developed as a part of the teaching assistantship for flipped classroom teaching model adopted by sardar patel institute of technology for. Rlc series and parallel circuits lab free class notes. Series parallel resonance parallel resonance is more difficult to define due to the fact that in real life the inductor will have a resistive value. Parallel resonance and parallel rlc resonant circuit. Following table mention comparison between series resonance circuit and parallel resonance circuit. This definition lends itself to laboratory measurement because it is possible to measure both the resonance frequency \. Therefore at the resonance the total current flows through the resistor. Now read the dmm for the following values of series resistance. In many ways a parallel resonance circuit is exactly the same as the series resonance circuit we looked at in the previous tutorial. Depending on the arrangement of the capacitors, inductors, and resistors, the conditions for achieving resonance varies between different types of. F capacitor in part 1, are the capacitors in series or in parallel.
Indicate the resonance frequency f o and the width of the resonance curve the bandwidth, which is the interval. The series resonance rlc circuit is shown in the figure below. Seriesparallel resonance parallel resonance is more difficult to define due to the fact that in real life the inductor will have a resistive value. This laboratory manual features a total of 15 experiments in the field of ac electrical circuit analysis. This is a followup lab to the previous theoretical and ltspice simulationbased lab, which studied the same topic. The objective of this lab activity is to study the phenomenon of resonance in rlc circuits.
To investigate the parallel resonance curve of r, l, c cct. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator producing a square wave. Put on the vertical axis the current or voltage across resistor r and log f on the horizontal axis. Figure 8 is a representative example of self resonance waveform for a 4. In addition to the resonant frequency, resonant circuits also exhibit lower. Prelab exercises are designed to enhance understanding of the concepts and calculate anticipated values subsequently measured in the lab. We wrap up transformers and have our last inclass test time permitting. To experimentally determine the resonance frequency in a series rlc circuit and compare this to the expected resonance value.
Experimental method, measurement and readings consider the parallel rlc circuit of figure 1. Experiments for first year electrical engg lab 201516 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 10 procedure for drawing series circuit phasor diagram. How did the behavior of the led differ when you added the second capacitor in part 1. Quality factor for the parallel rlc circuit is opposite to the series rlc circuit, which is given by the equation, v procedure. At the resonance frequency and the impedance seen by the source is purely resistive. For the purposes of this experiment we will assume the capacitor and inductor are ideal. Series and parallel circuits 85 advance reading text. Series parallel resonance circuit linkedin slideshare. Therefore, the current supplied to the circuit is max at resonance. Experiment 10 rlc series circuit resonance in an rlc series circuit objective. Connect a resistance substitution box in series between the dc power supply and the dmm. Determine the resonant frequency and bandwidth of the given network using the amplitude response to a sinusoidal source. For equipment, each lab station should include a dual channel oscilloscope preferably digital, a function generator and a quality. Compare measured and calculated voltages and current for a series parallel rlc circuit at discrete frequencies.
Resonance curve for parallel resonant circuit from equation 5. To introduce frequency response by studying the characteristics of. Sketch the so called resonance curve for the series resonance circuit in fig. Pdf simulation of rlc series and parallel resonance in. In actual, rather than ideal components, the flow of current is opposed, generally by the resistance of the windings of the coil. The current is small at parallel resonance and is sometimes called antiresonance. This is the function of rlc series and parallel circuits, which are resonant at a specific frequency. Lab 3 capacitors and series rc circuits 9 lab 4 inductors and series rl circuits 18 lab 5 parallel rc and rl circuits 25 lab 6 circuit resonance 33 lab 7 filters. Resonance is a phenomenon that occurs in electric circuits consisting of capacitors and inductors. This is practical of series resonance rlc ckt for basic electrical engineering. Lab manual for ac electrical circuits this is a laboratory manual covering ac electrical circuits, typically a first year course for students in an electrical engineering technology program. A parallel rlc circuit is an example of a bandstop circuit response that can be used as a filter to block frequencies at the resonance frequency but allow others to pass.
Then in a series resonance circuit as v l v c the resulting reactive voltages are zero and all the supply voltage is dropped across the resistor. This experiment will be used to examine the sinusoidal frequency. The impedance of an rlc series circuit at resonance is simply r. Sep 26, 2017 this is practical of series resonance rlc ckt for basic electrical engineering. Since the parallel resonant circuit can draw a very small current and power from the mains, therefore, it is also called as rejector circuit. The series rlc resonance circuit introduction thus far we have studied a circuit involving a 1 series resistor r and capacitor c circuit as well as a 2 series resistor r and inductor l circuit. To understand the resonance frequency, cutoff frequency, bandwidth and quality factor of a resonance circuit.
The voltage through an rlc series circuit will be measured as a function of frequency for a fixed applied voltage. Laboratory manual for ac electrical circuits dissidents. Ece311 ece, ndsu lab 10 experiment series and parallel. The relevant equations and characteristic bellshaped curves of the frequency response around resonance are given in section 2. A parallel circuit containing a resistance, r, an inductance, l and a capacitance, c will produce a parallel resonance also called anti resonance circuit when the resultant current through the parallel combination is in phase with the supply voltage. It begins with basic rl and rc operation and progresses through phasors to ac series, parallel and seriesparallel circuit configurations. For questions and revision requests, please contact chung yong chan at chungyong. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Set the resistance value to a low setting of 1 k carefully adjust the dc power supply to give a reading of 10v on the dmm. To determine if a circuit is inductive or capacitive.
The laboratory notebook is a record of all work pertaining to the experiment. This is a followup lab to the previous theoretical and ltspice simulationbased. There are three methods for defining parallel resonance, each resulting in a different resonant. Figure 8 is a representative example of selfresonance waveform for a 4. At resonance there will be a large circulating current between the inductor and the capacitor due to the energy of the oscillations, then. In a series resonance lc circuit configuration, the two resonances x c and x l cancel each other out. In a parallel tank lc circuit, this means infinite impedance at resonance.
Since this is a series circuit, the current found for. To study the frequency response of series and parallel resonance circuits and hence determine the resonant frequency, band width and quality factor qfactor. Therefore, v r v supply and it is for this reason that series resonance circuits are known as voltage resonance circuits, as opposed to parallel resonance circuits which are current resonance. To observe the relationships between the voltage and current across resistors, inductors, and capacitors in series combinations as the frequency of the source is varied. To determine equivalent parameters of parallel connection of twoport network. L resonance occurs when the voltage and current at the input terminals are in phase. Capactor, inductor, resistor, signal generator, ac milliammeter, wires etc. You will be building circuits similar to the ones you will be working with in homework and exam problems. When the lab exercise is over, all instruments, except computers.
The resonant frequency can be defined in three different ways, which converge on the same expression as the series resonant frequency if the resistance of the circuit is small. The parallel combination of the capacitor and the inductor act as an open circuit. And finally, a series lc circuit with the significant resistance in parallel with the capacitor the shifted resonance is shown below. Resonance in series and parallel circuits guided by. Group members hardik panchal 120119115 vivek panchal 120119122 parth panchal 120119120 3. In simple reactive circuits with little or no resistance, the effects of radically altered impedance will manifest at the resonance frequency predicted by the equation given earlier.
The resonance of a parallel rlc circuit is a bit more involved than the series resonance. Experiments in physics series and parallel resonant circuit. To study the behavior of series and parallel lc circuits at resonance. Prelab do the orcad simulations of both rlc parallel and rlc series circuits. Experiments for first year electrical engg lab 201516.
Depending on the particular values of r, l, and c, resonance occurs at one. Mechanical department elements of electrical engineering active learning assignment topic. The circuit connections are made as shown in figure. The q factor is defined in the same way as in series resonance. It begins with basic rl and rc circuits and progresses through phasors to ac series, parallel and seriesparallel circuits. Appendixc appendix dmm objective the objective of this lab is to study circuits with resistors connected in series, parallel, and combination. University of north carolina at charlotte department of. This video is about studying resonance in rlc series and parallel circuits. Seriesparallel combination circuits chapter from lessons in electric circuits vol 1 dc free ebook and lessons in electric circuits series. Resonance occurs when the capacitive impedance of the circuit is equal to the inductive impedance. Both are 3element networks that contain two reactive components making them a secondorder circuit, both are influenced by variations in the supply frequency and both have a frequency point where their two reactive components cancel each other out influencing. Nov 19, 2016 video developed as a part of the teaching assistantship for flipped classroom teaching model adopted by sardar patel institute of technology for first year engineering students. As a band stop filter as a tank circuit in oscillators as a plate load in if and rf amplifiers as i.
Objective the objective of this lab is to conduct laboratory experiments to study the behavior of series and parallel lc circuits at resonance. Theory in the previous experiment, you constructed 4 circuits. Pdf lab 8 rlc resonance margaret wettergreen academia. Apr 04, 2014 resonance in series and parallel circuits 1. Use pspice to simulate and analyze a series parallel rlc circuit at discrete frequencies and over a wide range of frequencies. It begins with basic rl and rc operation and progresses through phasors to ac series, parallel and series parallel circuit configurations. Simple series and parallel lc circuit resonance operation. The steadystate admittance offered by the circuit is. To find resonance frequency, bandwidth, q factor of rlc series circuit.