Parallel resonance parallel resonance means when the circuit current is in phase with the applied voltage of an ac circuit containing an inductor and a capacitor connected together in parallel. Ece lab iii ece 2201 semester i, 20072008 by sheroz khan experiment iii resonance in rlc circuits venue. Experiment 10 rlc series circuit resonance in an rlc series circuit objective. A series resonant circuit has the capability to draw heavy current and power from the. In many ways a parallel resonance circuit is exactly the same as the series resonance circuit we looked at in the previous tutorial. This experiment will be used to examine the sinusoidal frequency response of the series and. In the given experiment of a seriesparallel rlc circuit see figure 1 the. In this set of experiments you will explore resonance in a series rlc circuit, which have the resonance in relatively low and easy to handle frequency range.
Lets continue the exploration of the frequency response of rlc circuits by investigating the series rlc circuit shown on figure 1. Instrumentation and measurement laboratory in e2 i. Series resonance in the rlc series circuit, when the circuit current is in phase with the applied voltage, the circuit is said to be in series resonance. 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. 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. Indicate the resonance frequency f o and the width of the resonance curve the bandwidth, which is the interval. University of north carolina at charlotte department of.
Sketch the so called resonance curve for the series resonance circuit in fig. Let us understand the parallel resonance with the help of a circuit diagram shown below. You will be building circuits similar to the ones you will be working with in homework and exam problems. The circuit diagram of a series rlc circuit is shown in fig. Ece 562 series resonant circuit nl5 simulation page 2 purpose. Rlc series and parallel circuit at resonance is a part of basic electrical engineering course which is mandatory for all discipline students to aware the idea of resonance in all technical universities in india and abroad.
These values have been chosen so that the resonant frequency of the series rlc circuit will be about 12,000 hz in the high frequency version and 1100 hz in the low. 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. Start with dcaclab to enjoy unlimited, full version of dcaclab. Experiment 7 resonance objective this experiment investigates the voltage and current relationships in series and parallel resonant rlc circuits. Parallel resonance occurs when the supply frequency creates zero phase difference between the supply voltage and current producing a resistive circuit. Resonance experiment abstract we looked at a resonant circuit that was made up of an inductor a capacitor and some resistors. The data measured shows the frequencyselectivity characteristics of the two circuit structures. Series resonance vs parallel resonance difference between series resonance and parallel resonance. The components for this lab need to be selected specifically for this experiment.
The resonance condition arises in the series rlc circuit when the inductive reactance is equal to the capacitive reactance x l x c or x l x c 0. Simulation of rlc series and parallel resonance in basic. When the q is above 10, the formulas in this experiment are reasonably accurate. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator producing a square wave.
Identify series and parallel parts in the combination of connection of capacitors. Of primary importance is the establishment of the resonant frequency and the quality factor, or q, of the circuit with relation to the values of the r, l, and c components. Resonance in series and parallel circuits guided by. A variable noninductive resistor, a variable capacitor, a variable. 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. The circuit connections are made as shown in figure. At resonance, that difference will be zero, and only r will limit the current flow in the circuit. It also mentions what is resonance condition in electronic circuit.
Rlc series circuit and rlc parallel circuit lab, series parallel combinations, discrete frequencies, amplitude and phase measurements, dc circuit analysis, ac circuits. To understand the resonance frequency, cutoff frequency, bandwidth and quality factor of a resonance circuit. Experiments in physics series and parallel resonant. This laboratory is about studying resonance in rlc series and parallel circuits. For equipment, each lab station should include a dual channel oscilloscope preferably digital, a function generator and a quality. To study the behavior of series and parallel lc circuits at resonance. The three components consist of an inductor coil, a capacitor and a decade resistance box. The graph to the right shows normalized values of current through a series rlc circuit at frequencies ranging from 0. Apr 04, 2014 resonance in series and parallel circuits 1. Parallel resonance and parallel rlc resonant circuit. Repeat the experiment using for the series resonant circuitry in figure 3, and use l 33mh and c 0.
Switching our attention to series lc circuits, we experiment with placing significant resistances in parallel with either l or c. Rlc series and parallel circuits lab free class notes. To study the frequency response and to find resonant frequencies of lcr series and parallel circuits. This is because the circuits impedance is at the maximum value at this time. The v o voltage on the resistor is proportional to the series rlc circuit current.
The impedance of an rlc series circuit at resonance is simply r. This is the function of rlc series and parallel circuits, which are resonant at a specific frequency. Introduction this laboratory is about studying resonance in rlc series and parallel circuits. Quality factor for the parallel rlc circuit is opposite to the series rlc circuit, which is given by the equation, v procedure. Here, and solving for the resonance frequency we once again find that. Compare measured and calculated voltages and current for a series parallel rlc circuit at discrete frequencies. Lcr circuit series and parallel psbrahmacharys blog. 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. School of engineering electrical engineering department ee 219 electrical circuits lab experiment 7 resonance prepared by. Prelab exercises are designed to enhance understanding of the concepts and calculate anticipated values subsequently measured in the lab. Resistor, switch, one 4snap conductor, two 3snap conductors. The frequency of applied ac at which resonance takes place or current is maximum. This experiment will be used to examine the sinusoidal frequency response of the series and parallel to see at what frequency the current through an rlc series becomes or the voltage across a parallel rlc circuit reaches maximum value.
This topic is also a part of in laboratory of their curriculum. 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. The current across a parallel rlc circuit would take a minimum value when it is at resonance. To experimentally determine the resonance frequency in a series rlc circuit and compare this to the expected resonance value. Materials snap circuit kit stopwatch procedure part 1 1. Pdf simulation of rlc series and parallel resonance in. University of jordan school of engineering electrical.
Given similar types of circuits, many values relating to the current, voltage, frequencies can be anticipated to ensure future. Calculate the effective capacitance in series and parallel given individual capacitances. Resonance curve for parallel resonant circuit from equation 5. The relevant equations and characteristic bellshaped curves of the frequency response around resonance are given in section 2. Open drinks and food are not allowed near the lab benches. Depending on the particular values of r, l, and c, resonance occurs at one. This is a followup lab to the previous theoretical and ltspice simulationbased lab, which studied the same topic. Find the resonant frequency, w o using equation 1 and compare it to the experimental value in both cases. Pdf lab 8 rlc resonance margaret wettergreen academia. To investigate the parallel resonance curve of r, l, c cct.
The purpose of this lab is to simulate the series resonant circuit using matlab and nl5 to better familiarize the student with some of its operating characteristics. Capacitors in series and parallel in this experiment, you will compare the capacitance of circuits in series and parallel using snap circuits. What is the value of z in lcr series circuit at resonance. Several capacitors may be connected together in a variety of applications. The definition of the resonance frequency fr is that it is the operating frequency that makes an rlc circuit a resistive circuit which means the imaginary part of the total impedance z or the total admittance y becomes zero.
Experiments in physics series and parallel resonant circuit. Mechanical department elements of electrical engineering active learning assignment topic. For the reactance to be zero, impedance of the inductor must equal that of the capacitor. The resonance of a series rlc circuit occurs when the inductive and capacitive reactance are equal in magnitude but cancel each other because they are 180 degrees apart in phase. Now day by day students have different modes to perform the practical in the lab session. The resonance of a parallel rlc circuit is a bit more involved than the series resonance. Parallel resonance is not as straight forward as series resonance. Series parallel resonance circuit linkedin slideshare. Lab 5 rlc resonant circuits sem 2 2017 2018 kkkl1142. Makmal elektrik dan elektronik tahun 1 kkkl1142 academic year. Ece311 ece, ndsu lab 10 experiment series and parallel. This page on series resonance vs parallel resonance describes difference between series resonance and parallel resonance.
Group members hardik panchal 120119115 vivek panchal 120119122 parth panchal 120119120 3. Report any broken equipment or defective parts to the lab instructor. Put on the vertical axis the current or voltage across resistor r and log f on the horizontal axis. In the series and parallel resonance lab, the experiment used a series and a parallelresonant circuit to introduce frequency response. This is a followup lab to the previous theoretical and ltspice simulationbased. When the q is below 10, the circuit resistance makes most circuit calculation inaccurate. The voltage through an rlc series circuit will be measured as a function of frequency for a fixed applied voltage. Objective the objective of this lab is to conduct laboratory experiments to study the behavior of series and parallel lc circuits at resonance.
Derive expressions for total capacitance in series and in parallel. 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. Also to find the quality factor and band width in lcr series circuit. At resonance, the impedance of a branch with lc in series is equal to zero, which is equivalent to a short, and the admittance of a branch with lc in parallel is equal to zero, which is equivalent to an open. This lab will explore some of the following aspects of the series resonant. Maximum two components for each type for the demo mode this is a limited dcaclab demo and shows ads. That is why design of high frequency circuits is so much more difficult as even small inductance and capacitance of connections plays a role.
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