The frequency of applied ac at which resonance takes place or current is maximum. An rc circuit can be used to make some crude filters like lowpass, highpass and bandpass filters. 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. This is a linear differential equation, which you know how to solve. Test some conductors and insulators by bringing them into contact with both electrodes, simultaneously. Theory inductors and capacitors resistors r, inductors l and capacitors c are passive components commonly used in ac electrical circuits. 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. Experiment number 2 series rc and rl circuits objectives this activity aims to. Human circuit conductors and insulators experiments. In general, the complex impedance is defined as follows. Resistor r limits the circuit current to a suitable value for the zener diode and ujt.
First measure the capacitance of the large capacitor provided using a capacitance meter the nominal value is 47 f. Ac circuits rlc circuit introduction an inductor l is an important component of circuits, on the same level as resistors r and capacitors c. How are you going to determine the capacitance of the unknown capacitor using the oscilloscope in the first part of the experiment. The voltage through an rlc series circuit will be measured as a function of frequency for a fixed applied voltage. Lesson plan 11 australian broadcasting corporation.
Circuits laboratory experiment 3 ac circuit analysis. Lab 7 lr circuits introduction the english physicist michael faraday found in 1831 that when the current through a coil changes, the coil produces a changing magnetic field in addition to the field of the changing current, which induces an electromotive force emf in the coil itself. Use a 1 khz triangle wave with a 10volt peaktopeak magnitude zero dc offset as the input signal. 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. Circuits laboratory experiment 3 ac circuit analysis 3. Resistive elements are not connected in series or parallel. In this experiment, you can build a circuit similar to the one edison would have used in his laboratories. To analyze this type of circuit, it should first be simplified reduced to an equivalent resistor, req.
You should also solder in wires to measure the voltage over the resistor. The circuit can be thought of as being in two parts. Before conducting the experiment, the student is required to have read the experiment background and procedure from the experiment manual and studied the related theory. Chapter 21 2 voltage and current in rlc circuits iac emf source. Dc equivalent of an ac circuit with a resistor and capacitor. Clipping circuit design design a circuit to obtain an output waveform as shown in figure 7. Just because a circuit works in a simulation does not mean it will work in real life. Assume that the diodes used in the circuit are ideal.
On a copper strip board, construct the circuit shown in fig. For this project, you will need a penlight bulb, flashlight battery, two, 6inch pieces of wire, tape to keep the wire on the end of the battery, a small piece of flat metal, two thumbtacks and a small block of wood. 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. Rc, rl and rlc circuit basic principle and circuit. Circuit analysis with sinusoids let us begin by considering the following circuit and try to find an expression for the current, i, after the switch is closed. The student will measure the circuit current, the voltages across the resistor and the. Experiments for first year electrical engg lab 201516. The purpose of this experiment is to study the behavior of the current and voltages in an. Direct current circuit experiment as conclusion, we managed to study the concepts of potential different, electric current and resistance we also study ohms law and its application from the gradient of the graph v against i, we can calculated the. Bulb board with batteries, connecting wires, two identical bulbs and a different bulb, a digital multimeter with leads. Instead of analysing each passive element separately, we can combine all three together into a series rlc circuit. Then put on safety glasses, and construct the circuit as shown in figure 3, making sure the electrolytic capacitor is connected with correct polarity. Often in the development of electronic circuits it is required that voltages be limited in some manner to avoid circuit damage.
The rc circuit resistor capacitor circuit will consist of a capacitor and a resistor connected either in series or parallel to a voltage or current source. The highinput level is the value of vin that results in the transistor being at the edge of saturation eos. 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. An inductor shown in figure1a is usually constructed as a coil of.
Lots of hams experiment with satellites, tv, microwaves, and the new digital transmission modes. To study the variation in current and voltage in a series lcr circuit. To experimentally determine the resonance frequency in a series rlc circuit and compare this to the expected resonance value. Calculate i 1, i 2, i 3 and vo for the circuit shown in figure 1 for f 1khz and f 10khz. Electric current, resistance and voltage in simple circuits name. Try adding other elements to the closed circuit to search for electrical conductors and insulators. Many also build small projects that are designed to enhance or supplement commercial equipment. Capacitors a capacitor is a passive electronic component that stores energy in the form of an electrostatic field. Predict the expected output waveform of each circuit shown in figures 1 through 6. Determine the impedance of a series rc and rl circuit 4. Direct current circuit experiment by nurul ain on prezi.
A series rlc circuit this lab will let you learn the characteristics of both amplitude and phase of a series rlc circuit. Purpose a learn the usage of frequently used ac instrument equipment ac voltmeter, ac ammeter, power meter. Rlc circuit board pasco model ci6512 computer interface system pasco series 6500. Richard feynman 19181988 objectives to observe free and driven oscillations of an rlc circuit. Conductors allow electricity to flow through them while insulators resist current flow. To be familiar with the current and voltages across different circuit elements in a series circuit 2. Series rl circuit in a series rl circuit, the voltages across r and l will also be 90 o out of phase. Ac circuits rlc circuit introduction an inductor l is an important component of circuits, on the same level as resistors r and the capacitors c. In 1834, the german physicist heinrich lenz refined this further by showing that the induced. A synchronized ujt triggered circuit using an ujt is shown in the figure. This is a dc circuit with a voltage source given by.
Frequency response of resonant rlc circuit here will find the voltage across the resistor, vr, as a function of frequency, for the rlc circuit shown in figure 112. Experiment 8 rc circuits nature, to be commanded, must be obeyed. There are some opportunities for circuit building but most hams still opt for commercial gear and work at the system level. Experiment 5 measure the equivalent parameters in the ac. Rlc circuits it doesnt matter how beautiful your theory is, it doesnt matter how smart you are. What is the value of z in lcr series circuit at resonance. First, the generation, transmission, distribution, and consumption of electric energy occur under essentially sinusoidal steadystate conditions. Furthermore, the limiting or clipping of voltages can be. Rcrlc filters and labview description and background in this lab you will a manipulate instruments manually to determine the inputoutput characteristics of an rc filter, and then b use an instrument control system called labview made by national instruments, inc. Procedure y assemble the circuit shown in figure 5. Rlc series and parallel circuits lab free class notes online. Unless stated otherwise, for this experiment use the inductor without the steel core in its center.
Experiment 10 rlc series circuit resonance in an rlc series circuit objective. Lesson plan 11 electric experiments brief description students experiment with aluminium foil, batteries and cheap, readily availably low voltage light bulbs to construct a simple conductivity. Experiments for first year electrical engg lab 201516 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 3 procedure. In the experiment will plot these quantities, and you will find a resonance, as shown in figure 114. Construct the circuit shown in figure 1 and measure i 1, i 2, i 3 and vo.
Bacon 15611626 objective to study a simple circuit that has timedependent voltages and current. Switch on the dc voltage supply, adjust the voltage to any. To study the operation of ujt firing circuit for scr. Experimental verification of kirchhoffs voltage law and. Use pspice to determine i 1, i 2, i 3, and vo in figure 1 at f 1khz and f 10khz. In this experiment, you will measure vt across the capacitor as it discharges. The capacitor initially uncharged is connected to a voltage source of constant emf e. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator producing a square wave. Measure the equivalent parameters in the ac circuit 1. Learning electronic theory is all well and good, but like most real tasks, electronics is 20% theory and 80% practice. Theory circuits with steady currents and voltages are of some importance, but timevarying currents are more interesting. Electric current, resistance and voltage in simple circuits. Kids experiments with electrical circuits sciencing.