If the potential di erence across a resistor is set at 1 volt, and if a current of 1 amp is measured in the conductor, then its resistance is determined to be 1 ohm, or 1. Select manual with and then press three times to go back to the measurements and run the labdisc pressing. Ohms law lab report with graph, observations and verification. These physics lab manual may be freely downloadable and used as a reference book. Power supply producing an adjustable voltage from 030 v, two multimeters to measure voltage and current, a light bulb in a socket, a resistor, a breadboard and. 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. An ideal ammeter has an internal resistance of, while an ideal voltmeter has an internal resistance of. For materials that obey ohm s law some do not, a plot of voltage vs. Department of education fipse, 19932000 university of virginia physics department phys 241w, fall 2004 in this lab, you will first examine the role of the battery in causing a. Lab 3 physics 212 lab ohms law and resistors introduction the purpose of this experiment if to verify and to examine the limits of the ohms law for commercially manufactured devices.
Briefly discuss how the four values compare, and which you think is closest to the true value and why. Ohms law, resistance and resistivity msu physics lab. There are three scales on the meter in the picture. This laboratory manual is intended for use in a dc electrical circuits course and is appropriate for two and four year electrical engineering technology curriculums. Familiarize yourself with electrical measurements, explore the nature of ohms law, resistivity, and practice interpreting data with graphs. Applied engineering and technology building, suite 3. Instead of using thin wires as ohm did in his original experiment, you will replicate his results using small cylindrical ceramic resistors.
Ohm 1 ohms law in this lab we will make detailed measurements. To conduct a suitable experiment for verifying the ohms law apparatus required. 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. Theory ohms law describes the behavior of a resistor in the thermal range where the voltage across. 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. The object of this lab is to examine the relationship called ohm s law by determining the current versus potential relationship of resistors and a light bulb. 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. To study ohms law for dc circuits, to learn basic construction and. Time domain analysis 33 the response of an rc circuit 39 14 the response of an rl circuit 42 15 series resonant circuit 46. The concept of electrical resistance is both simple and.
Lab 3 physics 212 lab ohms law and resistors introduction the purpose of this experiment if to verify and to examine the limits of the ohms law for com. The voltage and current in simple electric circuits are related via the basic ohms law. Cbse class 10 science lab manual ohms law a plus topper. Accumulator or battery eliminator, ammeter, voltmeter, rheostat, coil, connecting wires and key if necessary. In particular, we will collect and analyze data for resistors and light bulbs. Introduction when an electrical potential v measured in volts is applied across a conducting line of resistance r measured in ohms, an electric current i measured in amperes flows in the. Plug the power amplifier into a power outlet, and use the audio cable to. Cbse physics lab manual for class 10 pdf download 1. The resistance is then the proportionality constant in ohm s law, and is the applied voltage divided by the current that flows. In the electric fields and potential experiment the notion that the electric field. The power amplifier is a variable source of voltage, and can provide us with a robust test of ohms law. These short reports need not describe the entire experiment. Equipment power supply, 10 ohm resistor, 50 ohm resistor, automotive bulb, 2multimeters and their manual. A tutorial for using the computers and the computerinterfaced equipment is located in a separate manual kept in room 305.
Lab report you must hand in a typed lab report for every lab you perform. To verify that voltage and current are directly proportional using a 1k. Set voltage to 0 v in your power supply and press start on your pasco interface. Voltmeter the black terminal is the negative or common terminal. Ohms law and resistors california state university. Construct a circuit using resistors, wires and a breadboard from a circuit diagram. Experiment 3 ohms law, measurement of voltage, current. According to ohms law, for an element of an electric circuit, the current in that element is directly proportional to the voltage. Ohms law, resistance and resistivity ohms law, resistance and resistivity objective the purpose of this experiment is to use graphical analysis to determine whether various circuit elements obey ohms law, and to determine the resistance for some that do. The manual contains sufficient exercises for a typical 15 week course using a two to three hour practicum period.
This article presents the complete ohms law lab report and various questions regarding the lab. Plot the two shaded columns as instructed in the postlab section. In this experiment you will verify ohms law in several different circuits using a current. Notice that wiring is simply a matter of following the circuit diagram. You will also learn the color code for resistors and study series and parallel combina. You will construct a circuit to observe the applied voltage versus current flow for several electronic devices and you will decide for yourself whether or not ohm s law has exceptions. The latter portion simplifies the law for beginners by delineating the absolute basic concepts for beginners. Investigations student lab manual includes over 40 labs and activities. Students will also be introduced to the resistor color code and refresh their graphing skills. Ohms law in this lab we will make detailed measurements on a resistor to see if it obeys ohms law. Type your name, date, the day of the week you did the lab, and the name of the ta.
Investigation of dccircuit resistance for resistors connected in series and in parallel and of a voltage current dependence ohms law. We will be using this same connection board in two other experiments in this lab. Cbse physics lab manual class 10 chapters wise download here in pdf format. Ohms law and electrical circuits introduction in this experiment, you will measure the currentvoltage characteristics of a resistor and check to see if the resistor satis es ohms law. In this lab, you will use a variable power supply to subject a resistor of known resistance to a variety of voltages. The real practically calculated red color vs the theoretical values blue are plotted on the graph. See appendix a for the instructions on determining consistency. Additionally, students will be introduced to the resistor color code. Jan 17, 2020 contents1 ncert class 10 science lab manual ohms law1. One piece of equipment that you will use throughout the lab is the protoboard. Materials required a voltmeter and ammeter of suitable range, resistance wire or resistor, some. Three resistors r1, r2, and r3 connected in series.
Ncert class 10 science lab manual ohms law cbse tuts. Ohms law is normally written as v ir 1 where r is the resistance of the resistor in ohm when potential difference v is in volt and current i in ampere a. Learning does not mean only gaining knowledge about facts and principles rather it is a path which is informed by scientific truths, verified experimentally. The multimeter the multimeter can be used as an ammeter, a voltmeter or an ohmmeter. Ohms law states that the electric current flowing through a conductor. Experiment 3 ohms law, measurement of voltage, current and. Ohms law was discovered by georg ohm when he was investigating the basic properties of electric currents in 1781. Exploring ohms law in parallel and series circuits weconsider thatall resistance loads were similar in thecircuits, can obtain total current in the parallel circuit is 9 times higher than the electric current in the series. Please note that the colors of the wires is not important.
Ohms law deals with the relationship between voltage and current in an ideal conductor. Contents1 ncert class 10 science lab manual ohms law1. V ir where zv is the applied potential difference, zi is the current flowing through the circuit, and zr is the resistance of the circuit. In this experiment, you will measure the currentvoltage characteristics of a resistor and check to see if the resistor satisfies ohms law. Microsoft word electrical circuits lab manual ii sem. Cbse class 10 science lab manual ohms law aim to study the dependence of potential difference v across a resistor on the current i passing through it and determine its resistance r.
Thornton supported by national science foundation and the u. One such advance was made by a german physicist named georg simon ohm. Voltage, current and resistance 1 voltage, current, and resistance overview. Ohms law equations fail if you mix terms, such as vt i r1 x r3.
Make sure the labpro interface is plugged into the usb port of the computer, its power supply is plugged in, and the interface is turned on. Magnetic force 1 rooms a116 and a119 or em of the electron room a data sheets for mag force i data and em data. Best of all, digital access to these online teacher resources is included with purchase of the lab manual. Cbse lab manual class 10 chapters wise download here in pdf format. Lab writeup download the lab writeup, and be sure to read it in preparation before coming to the lab. The first thing you should do is to make a copy of. Laboratory 1 ohms law concordia university nebraska. According to ohms law, there is a linear relationship between the voltage drop across a circuit element and the current. In the process you will learn how to use the multimeter to measure voltage, current, and resistance. Remember, the voltmeter circled v does not interrupt the flow of the circuit.
Measure the current for 10 different voltages, with the increment of 1v. The resistance is then the proportionality constant in ohms law, and is the applied voltage divided by the current that flows. You will then test some of the laws of circuit theory. Write the equation and a qualitative statement for ohms law. Empirical study comparing physical labs, tablets and desktops. Ohm s law a condition of some materials where the resistance is constant regardless of the voltage applied across the device. In general, the computerized version of a particular lab when applicable is presented alongside the traditional version, giving the instructor a choice between the two for that particular lab.
It is more forgiving than the current probe, but you will render it permanently inoperable if you exceed 7v. 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. Exploring ohms law in parallel and series circuits. Calculations verification of ohms law report the theoretical calculations are achieved from the original formula, v ir. I v r ohms law is among the most fundamental relationships in electrical engineering. Plot the two shaded columns as instructed in the post lab section. Resistance is a measure of how difficulty to flow current through the device. You can also verify them from the basic ohms law calculator. The voltage drop across the battery vt will be the total sum of the individual drops across each of the 3 resistors, and. We will also check the rules for combining resistors in series and parallel. Jan 31, 2018 cbse class 10 science lab manual ohms law aim to study the dependence of potential difference v across a resistor on the current i passing through it and determine its resistance r. 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. Ohm s law objective to study the relationship between the electrical current flowing through a circuit element and the voltage applied.
Comprehensive physics investigations student lab manual. The introduction should include a general overview of the ex. It if there is only one resistor you can think of that as rt. You now have a fourth value for the resistance of the resistor, from the slope of the graph. These lab manual may be freely downloadable and used as a reference book. The voltage drop across the battery vt will be the total sum of the individual drops. Brown black black, 1 lightbulb 1 voltage sensor ci6503 1 current sensor ci6556 1. Impedance matching experiment 6 rc constants experiment 7. In this lab, you will study the relationship between the voltage applied across a conductor and the current. In the last experiment we studied ohms law for a single resistor. This law states the relation among the three quantities voltage, current, and resistance.
Word and pdf versions of the lab instructions student worksheets blackline masters in word and pdf formats answer keys in word and pdf formats. 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 and resistance resources amrita online lab. Different color wires were used in these pictures to help illustrate how to wire the circuit. Therefore the resistance r is viewed as a constant independent of the voltage and the current. Lab 3 dc circuits and ohms 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. The objective of this lab is to determine the resistance.