Pdf lab 01 voltage and current measurement and ohms law in. Ohms law states that the amount of electric current through a conductor in a circuit is directly proportional to the voltage across it. Become familiar with the use of a digital voltmeter and a digital ammeter to measure dc voltage and current. The slope was an inverse representation of the graph which resulted in the resistance. The potential difference voltage across an ideal conductor is proportional to the current through it. Discussion ohms law discussion the purpose of this experiment was to verify ohms law which states that the potential difference across a conductor and discussion ohms law discussion the purpose of this. He finally published the law in 1827 and generalized his observations in single statement. Experimental verification of kirchhoffs voltage law and kirchhoffs current law abstract we have experimentally tested kirchhoffs voltage law and kirchhoffs current law by measuring the sum of the voltage drops around several closed paths, and the sum of. Resistance, ohms law, and i v curves lab report phys. Ohms law was verified in this lab experiment because the calculated resistance value 4.
Ohm s law lab report with graph, observations and verification ohm s law is the fundamental law of electrical engineering. Your objective will be to test ohms law, which asserts that the resulting current through the resistor as well as the rest of the circuit is proportional to the applied voltage. I v r ohms law is among the most fundamental relationships in electrical engineering. When the green power button is pushed in, the power supply is on. Purpose in the first part of this experiment you will observe a fundamental property of superconductors, the levitation of a magnet by a superconductor, illustrating the meissner effect. He finally published the law in 1827 and generalized his observations in single. My graph was my weakness in this experiment because the graph should have mentioned the resistance as it is a key fact of proving ohms law. Ohms law states that the total current in a circuit i is equal to the total impressed voltage e divided by the total series resistance r. One such advance was made by a german physicist named georg simon ohm. Georg simon ohm and ohms law article pdf available in ieee transactions on education 233. A voltmeter is a device equipped with probes that can be touched to two locations on a circuit to determine the electric potential difference across those.
Ohms law is defined as a fundamental rule for analyzing circuits which. Compute the total voltage of the circuit, the voltage drop in each resistor. V ir where i is the current measured in units of amperes, i, v is the voltage in units of volts, v and r is the resistance in units of ohms. Introductionohms law is used in electrical engineering to calculate the relationships betweencurrent, voltage and resistance. Gustav kirchoff in partial fulfillment of the requirements for technology 1811 electronic circuit technology lecture section 001 lab section 001 performed on. Lab 01 voltage and current measurement and ohms law in seriesparallel dc circuits bte2122 electrical fundamentals and circuit analysis i laboratory. Experiment 3 ohms law, measurement of voltage, current and. The voltage drop across the battery vt will be the total sum of the individual drops. This law states the relation among the three quantities voltage, current, and resistance. Ohms law tells us that if a conductor is at a constant temperature, the current flowing. For the final part of the experiment, close out of the ohms law file, and open the second ohms law file. You will apply various voltages across the resistor or circuit using a power supply, and measure the current i through the resistor and the voltage. V i r where v is voltage volts,i is current amps, andr is the resistance of the circuit element that we now measure in the unit of ohms.
A simple circuit is one that can be reduced to an equivalent circuit containing a single resistance and a single voltage source. Wires have resistance that depend on wire size, length, and type of material. How electrical charge relates to voltage, current, and resistance. The current flowing through a constant resistor is directly proportional to the voltage applied to its ends.
The article discusses the feasibility of returning to the original formula of ohms law, because it more clearly and adequately reflects the content of the process of the passage of electricity. To study ohms law for dc circuits, to learn basic construction and measurement of electric. You can find the lab report, reading, observations, and theory here. Discussion the purpose of this experiment was to verify ohms law, which states that the potential difference across a conductor and the current through it are directly proportional. In this experiment you will verify ohms law in several different circuits using a current. The constant of proportionality is called the resistance, r. Leds are fragile and can only have a certain amount of current flowing through them before they burn out.
The constant r represents the opposition to a flow of electrical charges in a conductor. Measure the actual resistance, r, of the three resistors using the ohmmeter and record them in the table provided. The voltage drop across the battery vt will be the total sum of the individual drops across each of the 3 resistors, and. Ohms law tells us that if a conductor is at a constant temperature, the current flowing through the conductor is directly proportional to the voltage across it. Put the results on the table in theoretical value group. Accumulator or battery eliminator, ammeter, voltmeter, rheostat, coil, connecting wires and key if necessary. Ohms law is named after george simon ohm a german physicist. Discuss the consistency of the resistance found using the color codes. A conductor has a resistance of one ohm if a potential difference of one volt across the conductor results in a current of. Ohms law pt1 setting up the multimeter to measure current and voltage. One of the fundamental rules for electrical engineers is ohms law, named for georg simon ohm 17891854. Conclusion ohms law deals with the relationship between voltage and current in an ideal conductor.
Address the answers to the three discussion questions on page 6 of the handout proper materials, etc. For this experiment current controls need to be turned completely counterclockwise we will later adjust the current to 1a. Teaching simple circuits and ohms law to students in the introductory classroom has been extensively investigated through the common practice of using incandescent light bulbs to help students. Students will also be introduced to the resistor color code and refresh their graphing skills. This can be expressed in an equation as vir and can be manipulated to find the other two variables. Ohm performed repeated experiments on a resistor, applied different voltages, measured current and found relationship between these quantities. Determine the nominal resistance for the three resistors. To verify ohms law, the mathematical relationship among current. Most basic components of electricity are voltage, current, and resistance. The attached lab report is an example of what is considered an appropriate lab report in this course.
The current flowing through the resistor is directly proportional to the voltage applied across it. Power supply for this experiment current controls need to be turned completely counterclockwise we will later adjust the current to 1a. What ohms law is and how to use it to understand electricity. Voltage controls completely clockwise notice that there is a. Construct a circuit using resistors, wires and a breadboard from a circuit diagram. This means that if we plot voltage on the xaxis of a graph and current on the yaxis of the graph, we will get a straightline. Before moving on to the results and discussion, we need. Ohms law definition, formula, applications of ohms law. Three resistors r1, r2, and r3 connected in series. Electrical current, \i\, is defined as the rate of flow of charge through a circuit. An experiment of ohms law dana santika physics ganesha university of education.
The potential difference voltage across an ideal conductor is. In the documentation for an led, there will always be a current rating. Define the critical temperature for a superconducting material. It relates the current flowing through any resistor to the voltage applied to its ends. Ohms law states that the current i in a resistor is proportional to the potential difference v across it, provided that the temperature of the object is constant. Ohms law deals with the relationship between voltage and current in an ideal conductor. This article demonstrates the ohm s practical experiment. Ohm expressed his discovery in the form of a simple equation, describing how voltage, current, and resistance relate to each other. Your lab report for this experiment should contain the following sections. Ohm discovered a linear relationship between voltage and current in many circuit elements. Set the current through the stainless steel wire at. Ohms law simon ohms amazing experiment and results. Press start, and change the calculated current in the table to the.
Ohms law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. The ohms law equation is often explored in physics labs using a resistor, a battery pack, an ammeter, and a voltmeter. Experimental verification of kirchhoffs voltage law and kirchhoffs current law abstract we have experimentally tested kirchhoffs voltage law and kirchhoffs current law by measuring the sum of the voltage drops around several closed paths, and the sum of the currents at several nodes, in two resistive circuits. Discussion ohms law discussion the purpose of this. Experimental verification of kirchhoffs voltage law and. Explain in words any method for measuring the critical temperature in a superconductor.
Experiment 3 ohms law, measurement of voltage, current. Three quantities which are fundamental to electric circuits are current, voltage potential difference and resistance. Ohm s law states that the current i in a resistor is proportional to the potential difference v across it, provided that the temperature of the object is constant. Introduction ohms law our main purpose in the ohms law part of the experiment is for you to gain experience. For this experiment, we want to use a 9 volt battery to power an led. Apr 19, 2016 sample labreport on verfication of ohms law 1. To demonstrate ohms law, measure several sets of the voltage drop across a stainless steel wire and the corresponding current through it.
Lab 3 dc circuits and ohm s law introduction during the nineteenth century so many advances were made in understanding the electrical nature of matter that it has been called the age of electricity. Physics 263 sample lab report the attached lab report is an. Ohms law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The objective of this experiment is to use ohms law to determine the resistance of several individual resistors and the equivalent resistance of series and parallel combinations. The website is a dedicated resource for ohms law, calculation tools, applications and theoretical calculations on ohms law. This relationship between current, voltage, and relationship was discovered by german scientist georg simon ohm. Ohms lawmeasuring voltage, current, and resistance in this part of the experiment, you will assemble a circuit with resistors, and measure the voltage drops across various elements in the circuit, using the positive square wave from the signal generator as a voltage source. In this experiment, we were exploring the properties of ohms law by measuring. Wires add series resistance to circuits, just as good and bad connections add also.
Ohms law can be used to identify the relationship between voltage, current, and resistance in any dc electrical circuit discovered by a german physicist named, georg ohm. Pdf lab 01 voltage and current measurement and ohms law. An ohm s law experiment for this experiment, we want to use a 9 volt battery to power an led. A dc variable supply voltage is connected with a positive terminal at point a and negative. To verify ohms law, which defines the relationship between voltage, current and resistance in a series circuit. To measure the time constants associated with a discharging and charging rc resistivecapacitive, or resistorcapacitor circuit. A weakness in my experiment is my graph of the results.
Download fulltext pdf georg simon ohm and ohms law article pdf available in ieee transactions on education 233. To investigate ohms law and to determine the resistance of a resistor. Appendix b, appendix c dmm objective the objective of this lab is to determine the resistance of several resistors by applying ohms law. Ohms law iiiresistors in series and parallel v rrr 2 1 2 3 e v 1 v 3 v t i 1 i i t 2 i 3 figure 1. Ohm s law iiiresistors in series and parallel however, all wires that make connections and the connections themselves qualify as series resistance. Using equipment of his own creation, ohm found that there is a direct proportionality between the potential difference voltage applied across a conductor and the resultant electric current. Ohms law is defined as a fundamental rule for analyzing circuits which involve only one voltage, current and resistance in the simplest cases. Halliday and resnick chapter 26 sections 261 to 268 equipment. In this lab, you will use a variable power supply to subject a resistor of known resistance to a variety of voltages. Print 1 copy of the report page to start your lab report.
To verify ohms law, the mathematical relationship among current, voltage or potential difference, and resistance, in a simple circuit. To verify kirchhoffs laws by comparing voltages obtained from a real circuit to those predicted by kirchhoffs laws. Experiment to verify ohms law rolla tyas amalia grade 11 for a conductor at constant temperature, the current in the conductor is proportional to the potential difference across it. An ammeter is a device used to measure the current at a given location. Let us learn more about ohms law, resistance, and its applications. Pdf on feb 19, 2015, joshua mainsmith and others published ohms law. Voltage controls completely clockwise notice that there is a coarse and fine adjustment for both current and voltage. Seminar assignments ohms law abstract and discussion. This law states that voltage is equal to the product of the total current and the total resistance. Ohms law lab report electrical resistance and conductance.