To compare the emf of two given primary cells using a potentiometer and to determine the internal resistance of given primary cell using potentiometer if this. To determine resistance per unit length of a given wire by plotting a graph of potential difference versus current. Emf stands for electromotive force, which is the maximum terminal voltage. For instance, a temperature sensor in an oven often consists of a resistor with a resistance that increases with temperature. This experiment aimed at analyzing the phosphoric acid content of an unknown sample using potentiometric titration. Pcee7204 electrical and electronics measurement lab. Analog to digital conversion, adc0804 concept, testing, analysis performance, applications introduction. The experimental data was then compared with a theoretical model. The wheatstone bridge introduction the wheatstone bridge is a circuit used to compare an unknown resistance with a known resistance. The asm code is activated into the mcu following the standard procedure learned in lab 1. Potentiometric titrations provide more reliable data than data from titrations that use chemical indicators and are particularly useful with colored or turbid solutions and for detecting the presence of unsuspected species. Phys 203 potentiometer lab phys 203crn section xx lab. Two students will work on the same computer and will obtain the same set of data.
With your lab partners, prepare a data sheet and summary of this experiment. Use a potentiometer to vary the voltage across the bulb measured by the voltmeter v. Physics lab magnetic field strengths practical reports really basic. Objectives on completion of this experiment you will, understand how linear and rotary potentiometers attach to a system to measure displacement. It can also use as a variable resistor in most of the applications. Lab manual iii sem page 6 experiment 2 experiment name. Slide wire potentiometer, battery or power supply, rheostat, double poledouble. View lab report phys 203 potentiometer lab from phys 203 at west virginia state university. Slide wire potentiometer, battery or power supply, rheostat, double poledouble throw dpdt switch, standard cell, unknown cell, galvanometer, key switch and a multimeter. To measure the emf of an unknown cell using a potentiometer. To find the resistance of the given wire using meter bridge and hence determine the specific resistance of its material. Potentiometric titrations a potentiometric titration is an experiment where, rather than using an indicator that only identifies the titration endpoint, the entire progress of the titration is monitored via a potential measurement.
Arduino leonardo 2009 board the arduino shown in figure 1 is a relatively inexpensive, yet versatile opensource microcontroller. Measurements using comparison methods are capable of a high degree of accuracy because the result obtained does not depend. Lab 3 introduction to arduino introduction to arduino. When you complete this experiment, you will have verified the superposition theorem as applied to multiplesource dc circuits. Potentiometer, 012 volt power supply, flashlight, standard cell, galvanometer, double pole switch, slide wire resistor, carbon pile resistor, voltmeter and resistor. Two students were performing the potentiometer experiment to determine the emf of a cell using the circuit shown in the figure. Simple resistor circuits introduction in this lab, we will investigate ohms law, and study how resistors behave in various combinations. Collect data of vvalues and corresponding ivalues from the ammeter over the voltage range 012 v. Between the two ends the resistance is nominally 10k. It consists of a long wire of uniform crosssectional area and of 10 m. Introduction a potentiometer is an instrument designed to measure an unknown voltage by comparing it with a known voltage. What are voltages a, b, and c for this setting of the potentiometer. In this experiment, you will use a ph meter to follow the course of acidbase titrations.
Standardization of the potentiometer and use the same. With the dial of the pot facing you and the legs pointing down, what is the. Experimental setup the experimental setup for this experiment consists of a dc electric motor, a speedcontrol potentiometer and its electronics, an emitterdetector sensor, a. Potentiometer, leclanche cell or dry cell, an ammeter, one resistance box rbox 1 about 050. To compare emf of two given primary cells using potentiometer. Calibration of voltmeters and ammeter by potentiometer 2. To compare the emfs of two given primary cells using a potentiometer. Physics helpline l k satapathy direct current 4 errors in potentiometer experiment question. To compare the emf of two given primary cells using potentiometer.
In this experiment, you will more closely examine the effect of junction temperatures on the thermocouple voltage using water at three known temperatures. The terminal voltage of a cell is the potential difference between its terminals. In the window that opens, click on the button labeled logger pro to open the logger pro software. The method was described by johann christian poggendorff around 1841 and became a standard laboratory measuring technique. A ph electrode should be plugged into channel 1 of the interface box. Potentiometer mechanics manufactured goods free 30day trial. Students are able to construct circuits based on circuit diagrams. The resistance between the wiper b and either side of the outer terminals a or c.
Lab report 7 shameet patel phys255b006 the potentiometer. Theory the purpose of this experiment is to measure the electromotive force emf and internal resistance of a dry cell. In the lab, you will work with the blue led you used in a previous lab reference c503bbcn. The potentiometer is an electric instrument that used to measure the emf electro motive force of a given cell, the internal resistance of a cell. To compare the emf of two given primary cells daniel and leclanche cells using a potentiometer. Experiment 18 chem 10 general chemistry iilab studocu. Abstract the main purpose of this experiment is to use the potentiometer to measure the emf of a cell. Be sure to follow the guidelines distributed in class for your lab report. It is a single channel ic that can only take 1 analog signal as input. Have produced a calibration graph of both types of device and make judgements on. Connect the jtype thermocouple red and white wires to the voltage terminals on the daq system labeled channel 5. Students understand the different component used in the experiment.
Click on the applications folder at the bottom of the screen. From the resulting titration curves, you will determine the concentrations of the acidic solutions as well as the acidionization constant of a weak acid. In order to calibrate a voltmeter and to contrast the emf. You can think of a long wire as several short segments of wire that are connected in series. Seminar assignments, experiment molar solubility, commonion effect experiment 24report lab report exp 34 experiment 24 alum sp 192 some stuff from a different school, most likely wont be useful an equilibrium constant, resluts only. Physics helpline l k satapathy direct current 4 potentiometer experiment 1 errors in potentiometer experiment a g 2. Answer any questions posed in the manuals procedure steps for the experiment in question in the order that they appear. University of jordan school of engineering electrical. Include units and appropriate number of significant digits. As a continuously variable value, analog voltage varies within a continuous range. Potentiometer is a simple device used to measure the electro motive force, potential difference across a resistor and internal resistance of a cell. The emf of a cell may be defined as the terminal voltage of the cell when not under load, that is. Along the way, you will establish that certain measurements are a ected by the way in which circuit elements are connected to each other. The final step of the lab was to examine the harmonic components that are introduced into the light bulb voltage as a result of the switching that occurs in the circuit.
During titration, the data was obtained by monitoring the change in ph instead of using visual indicators to determine the endpoint. Apparatus and material required potentiometer, a leclanche cell, a danie l cell, a two way key, a r esistance. A typical set up for potentiometric titrations is given in figure 2. A meter bridge, galvanometer, one way key, a resistance box, a battery jockey, unknown resistance wire about 1 meter long, screw gauge and connecting wires. Temperatures and pressures in petroleum refineries and petrochemical plants april 1998. A potentiometer is a variable resistor consists usually of a turning dial to change the value of its resistance between two of its terminals. As described in the lab lecture the potentiometer is a three terminal device. Potentiometer physics 184 experiment 3 potentiometer. The web master makes no claims as to the correctness of the following answers 1. The known voltage may be supplied by a standard cell or any other known voltage reference source. Principal purposes of the study are a to understand quantitative relationships between electrode potential and concentration and b to use that information to understand how absolute and relative. Potentiometer working, their applications and different types. Pdf potentiometric determination of phosphoric acid in.
It is designed to facilitate interaction with the physical world via sensors. In this lab the ph a converted potential is monitored. Building the potentiometer circuit 5 minutes if you did the properties of resistors lab, you might recall that the longer the wire, the more resistance it has. This report presents a more realistic model of a resistive potentiometer and shows how qucs can be used to develop practical models of this fundamental component that give an order of magnitude improvement over the commonly used two resistor models. For ten different length of potentiometer wire, collect voltage and current data. Introduction in this lab experiment we will be using the potentiometer to measure emf.
Experiment 7 potentiometric titrations and multiprotic acids. Phys 203 crn section xx lab report for experiment 19. The deflection of the beam was measured with both a dial gauge and a potentiometer. Determine the expected vout, based on your measurements of the applied voltages, the total potentiometer resistance, rbot, and rtop. Converting analog to digital signals and vice versa is essential for todays technology were pretty well everything electronic audio, video, and data of all kinds is processed. Slide wire potentiometer, galvanometer, dc power supply, resistor, connecting wires, a battery is a source of electrical energy just like. This experiment will test and exercise the principles of acidbase titration and determination of equivalence, as well as exercises on the determination of the pka of a weak acid. Calibration of voltmeter using dc potentiometer calibration of ammeter using dc potentiometer apparatus required.
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