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