The capacitance was varied and the periods of the oscillations were used to determine the inductance in the circuit. An rlc circuit is an electrical circuit it consists of a resistor, inductor, and capacitor they are represented by the letters r, l and c. Oscillation and damping in the lrc circuit 7 where n is the number of cycles per decay time. An lcr circuit is an electrical circuit consisting of a resistor r, an inductor l, and a capacitor c, connected in series or in parallel. A series rlc circuit driven by a constant current source is trivial to analyze. Repeat the experiment by placing a glass sheet between the plates of capacitor and. Introducing the resistor increases the decay of these oscillations, which is also known as damping.
Rlc natural response intuition article khan academy. Richard feynman 19181988 objectives to observe free and driven oscillations of an rlc circuit. Rlc circuits it doesnt matter how beautiful your theory is, it doesnt matter how smart you are. The name of the circuit is derived from the letters that are used to denote the constituent components of this circuit, where the sequence of the components may vary from rlc. Rc, rl and rlc circuits y you have just determined this circuit s time constant from the capacitor discharging curve. Series rl circuit in a series rl circuit, the voltages across r and l will also be 90 o out of phase. First, the generation, transmission, distribution, and consumption of electric energy occur under essentially sinusoidal steadystate conditions. Series rlc circuits consist of a resistance, a capacitance and an inductance connected in series across an alternating supply. To measure the resonance frequency and the quality factor of a driven rlc circuit by creating a resonance frequency response curve. Now turn back to the rlc circuit, and use kirchoffs law with regards to voltages around the.
Ac circuits rlc circuit introduction an inductor l is an important component of circuits, on the same level as resistors r and capacitors c. It can occur in all sorts of systems, from a swinging mechanical pendulum to an optical cavity. The student will measure the circuit current, the voltages across the resistor and the. Measurements performed on an electric circuit include the circuit current, voltage, power, and resistance. They can be used to select a certain narrow range of frequencies from the total spectrum of ambient radiowaves. 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. Experiments for first year electrical engg lab 201516 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 11 experiment no. The analysis of a series rlc circuit is the same as that for the dual series r l and r c circuits we looked at previously, except this time we need to take into account the magnitudes of both x l and x c to find the overall circuit reactance. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator. This experiment will be used to examine the sinusoidal frequency response of the series and. Using ni multisim to design and simulate rlc series. This paper presents the remote experiment serial and parallel rlc circuit. A parallel rlc circuit driven by a constant voltage source is trivial to analyze.
Using 12 switches, different connections between a resistor, an inductor and a capacitor, can be made. Rlc series circuit introduction the objective of this experiment is to study the behavior of an rlc series circuit subject to an ac input voltage. To experimentally determine the resonance frequency in a series rlc circuit and compare this to the expected resonance value. Chapter 21 2 voltage and current in rlc circuits iac emf source. Instrumentation and measurement laboratory in e2 i. Circuits laboratory experiment 3 ac circuit analysis 3. An inductor l is an important component of circuits, on the same level as resistors r and capacitors.
Theoretically, the time constant is given by the product of the resistance and capacitance in the circuit, rc. Figure 2 shows the setup for the experiment where the driving voltage. Download as docx, pdf, txt or read online from scribd. The circuit forms a harmonic oscillator for current, and resonates in a similar way as an lc circuit.
Amfm radio with analog tuners use a rlc circuit to tune a radio frequency. Instead of analysing each passive element separately, we can combine all three together into a series rlc circuit. While this is somewhat illuminating, it should be reminded that. The following plots show vr and vin for an rlc circuit with. Circuits laboratory experiment 5 circuits containing inductance 5. Pdf lab 8 rlc resonance margaret wettergreen academia. Introduction this laboratory is about studying resonance in rlc series and parallel circuits. To study resonance in an rlc circuit by examining the current through the circuit as a function of the frequency of the applied voltage.
If the experiment had been repeated with frequencies 10 times higher than those in table 4. The inductor is based on the principle of inductance that moving charges create a magnetic eld the reverse is also true a moving magnetic eld creates an electric eld. These include as buffers on large transmission lines to reduce energy surges, on a smaller scale. Multimeter and rlc circuit module introduction recall from last weeks lab that, for a series ac circuit, ohms law still applies, but in order to describe the circuit. The first is referred to as the seriesresonant circuit and the second as the parallelresonant circuit. Unless stated otherwise, for this experiment use the inductor without the steel core in its center. Ece 2006 university of minnesota duluth lab 10 ece department page 4 april 1618, 2007 figure 3. Rlc circuit board pasco model ci6512 computer interface system pasco series 6500.
To see the phase relationships between driving voltage and driven current in such a circuit at, below, and above the resonance frequency. As a single, lumped element, inductors find many uses. Using 12 switches, different connections between a resistor. Vr 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. Pdf this paper presents the remote experiment serial and parallel rlc circuit. Be able to determine the responses both natural and transient of second order circuits with op amps. Rlc circuit given v s is a phasor of 5 volts rms and 0 degrees of phase angle chosen as the reference phasor, calculate the resonant frequency, f0, and find the impedance of the circuit as seen by the source for each of the frequencies in table 1. The name rlc circuit is derived from the starting letter from the components of resistance, inductor, and capacitor. The purpose of this experiment was to observe and measure the transient response of rlc circuits to external voltages.
An rlc circuit aka resonant circuit or tuned circuit is an electrical circuit. For the love of physics walter lewin may 16, 2011 duration. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator producing a square wave. An rlc circuit or lcr circuit is an electrical circuit consisting of a resistor. The voltage through an rlc series circuit will be measured as a function of frequency for a fixed applied voltage. The impedance of an rlc series circuit at resonance is simply r. We measured the time varying voltage across the capacitor in a rlc loop when an external voltage was applied. 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.
Introduction to basic laboratory test and measurement equipment this experiment is intended to give the student a quick exposure to. This laboratory manual is intended for use in an ac electrical circuits course and is appropriate for either a two or four year electrical engineering technology curriculum. Be able to determine the step responses of parallel and series rlc circuits 3. Circuits laboratory experiment 3 ac circuit analysis. An intuitive description of the natural response of a resistorinductorcapacitor rlc circuit. This is an rlc circuit, which is an oscillating circuit consisting of a resistor, capacitor, and inductor connected in series. The resonant rlc circuits are connected in series and parallel. This experiment shows you some of the properties of circuits which contain resistors, capacitors, and inductors. If the series rlc circuit is driven by a variable frequency at a constant voltage, then the magnitude of the current, i is proportional to the impedance, z, therefore at resonance the power absorbed by the circuit must be at its maximum value as p i 2 z. Rc, rl and rlc circuit basic principle and circuit. That is why design of high frequency circuits is so much more difficult as even small inductance and capacitance of connections plays a role. Since the current through each element is known, the voltage can be found in a straightforward manner. The circuit forms an oscillator circuit which is very commonly used in radio receivers and televisions. The manual contains sufficient exercises for a typical 15 week course using a two to three hour practicum period.
An rlc circuit is an electrical circuit consisting of a resistor r, an inductor l, and a capacitor c, connected in series or in parallel. To explore the time dependent behavior of rc and rl circuits prelab reading introduction when a battery is connected to a circuit consisting of wires and other circuit elements. Experiment 10 rlc series circuit resonance in an rlc series circuit objective. Series lcr circuit has applications in radio and communication engineering. Experiments for first year electrical engg lab 201516.