Theory the purpose of this experiment is to measure the electromotive force emf and internal resistance of a dry cell. Slide wire potentiometer, battery or power supply, rheostat, double poledouble. This experiment aimed at analyzing the phosphoric acid content of an unknown sample using potentiometric titration. To compare the emfs of two given primary cells using a potentiometer. When you complete this experiment, you will have verified the superposition theorem as applied to multiplesource dc circuits.
Phys 203 crn section xx lab report for experiment 19. Analog to digital conversion, adc0804 concept, testing, analysis performance, applications introduction. It can also use as a variable resistor in most of the applications. Students are able to construct circuits based on circuit diagrams. Objectives on completion of this experiment you will, understand how linear and rotary potentiometers attach to a system to measure displacement. In order to calibrate a voltmeter and to contrast the emf. Include units and appropriate number of significant digits. Apparatus and material required potentiometer, a leclanche cell, a danie l cell, a two way key, a r esistance. A potentiometer is a variable resistor consists usually of a turning dial to change the value of its resistance between two of its terminals. University of jordan school of engineering electrical. To determine internal resistance of the given cell using potentiometer.
Signature 1 voltage and current detection circuitry. The asm code is activated into the mcu following the standard procedure learned in lab 1. In the window that opens, click on the button labeled logger pro to open the logger pro software. Pdf potentiometric determination of phosphoric acid in. 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. In this experiment, you will more closely examine the effect of junction temperatures on the thermocouple voltage using water at three known temperatures. The resistance between the wiper b and either side of the outer terminals a or c. Two students will work on the same computer and will obtain the same set of data. Introduction a potentiometer is an instrument designed to measure an unknown voltage by comparing it with a known voltage. To find the resistance of the given wire using meter bridge and hence determine the specific resistance of its material.
Figure measuring the resistance of the potentiometer only connect one leg at a time. It consists of a long wire of uniform crosssectional area and of 10 m. Calibration of voltmeters and ammeter by potentiometer 2. The emf of a cell may be defined as the terminal voltage of the cell when not under load, that is. Potentiometer, 012 volt power supply, flashlight, standard cell, galvanometer, double pole switch, slide wire resistor, carbon pile resistor, voltmeter and resistor. Arduino leonardo 2009 board the arduino shown in figure 1 is a relatively inexpensive, yet versatile opensource microcontroller. Potentiometer working, their applications and different types. Phys 203 potentiometer lab phys 203crn section xx lab. Potentiometer is a simple device used to measure the electro motive force, potential difference across a resistor and internal resistance of a cell. 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.
The web master makes no claims as to the correctness of the following answers 1. As a continuously variable value, analog voltage varies within a continuous range. Experimental setup the experimental setup for this experiment consists of a dc electric motor, a speedcontrol potentiometer and its electronics, an emitterdetector sensor, a. Students understand the different component used in the experiment. A ph electrode should be plugged into channel 1 of the interface box. With your lab partners, prepare a data sheet and summary of this experiment. Collect data of vvalues and corresponding ivalues from the ammeter over the voltage range 012 v. Annotated lab report abstract a small steel beam was placed on an aluminium extrusion frame and mass was applied incrementally to one end, whilst the other end remained fixed. Potentiometer, 012 volt power supply, flashlight, standard cell, galvanometer, double pole switch, slide wire resistor, carbon pile resistor, voltmeter and resistor decade box.
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. 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. Lab 3 introduction to arduino introduction to arduino. Along the way, you will establish that certain measurements are a ected by the way in which circuit elements are connected to each other. Temperatures and pressures in petroleum refineries and petrochemical plants april 1998. The deflection of the beam was measured with both a dial gauge and a potentiometer. View lab report phys 203 potentiometer lab from phys 203 at west virginia state university. Abstract the main purpose of this experiment is to use the potentiometer to measure the emf of a cell. To determine resistance per unit length of a given wire by plotting a graph of potential difference versus current. 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. Homework statement in this experiment, were trying to study the characteristics of a light bulb. In order to calibrate a voltmeter and to contrast the emf of a cell with its terminal voltage. In this lab the ph a converted potential is monitored. 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. To compare the emf of two given primary cells daniel and leclanche cells using a potentiometer. Physics lab magnetic field strengths practical reports really basic. What are voltages a, b, and c for this setting of the potentiometer. Potentiometric analysis is based on measuring the potential of electrochemical cells in which the current does not flow. 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. As described in the lab lecture the potentiometer is a three terminal device.
To compare the emf of two given primary cells using potentiometer. To compare emf of two given primary cells using potentiometer. Emf stands for electromotive force, which is the maximum terminal voltage. 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. Calibration of voltmeter using dc potentiometer calibration of ammeter using dc potentiometer apparatus required. Physics helpline l k satapathy direct current 4 potentiometer experiment 1 errors in potentiometer experiment a g 2. Experiment 7 potentiometric titrations and multiprotic acids.
Between the two ends the resistance is nominally 10k. For ten different length of potentiometer wire, collect voltage and current data. Connect the jtype thermocouple red and white wires to the voltage terminals on the daq system labeled channel 5. Potentiometer, a leclanche cell, a daniel cell, an ammeter, a voltmeter, a galvanometer, a battery or battery eliminator, a rheostat of low resistance, a resistance box, a one way key, a two way key, a jockey, a set square, connecting wires and a piece of sand paper. Potentiometer physics 184 experiment 3 potentiometer. In the lab, you will work with the blue led you used in a previous lab reference c503bbcn.
Slide wire potentiometer, battery or power supply, rheostat, double poledouble throw dpdt switch, standard cell, unknown cell, galvanometer, key switch and a multimeter. 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. Use a potentiometer to vary the voltage across the bulb measured by the voltmeter v. Slide wire potentiometer, galvanometer, dc power supply, resistor, connecting wires, a battery is a source of electrical energy just like. Physics helpline l k satapathy direct current 4 errors in potentiometer experiment question. Two students were performing the potentiometer experiment to determine the emf of a cell using the circuit shown in the figure. Click on the applications folder at the bottom of the screen.
The wheatstone bridge introduction the wheatstone bridge is a circuit used to compare an unknown resistance with a known resistance. Be sure to follow the guidelines distributed in class for your lab report. The terminal voltage of a cell is the potential difference between its terminals. Lab report 7 shameet patel phys255b006 the potentiometer. The experimental data was then compared with a theoretical model. Pcee7204 electrical and electronics measurement lab. Standardization of the potentiometer and use the same. Introduction in this lab experiment we will be using the potentiometer to measure emf. 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. The method was described by johann christian poggendorff around 1841 and became a standard laboratory measuring technique. Simple resistor circuits introduction in this lab, we will investigate ohms law, and study how resistors behave in various combinations. Introduction this experiment introduces the directmeasurement approach to potentiometry. 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.
To measure the emf of an unknown cell using a potentiometer. In this experiment, you will use a ph meter to follow the course of acidbase titrations. From the resulting titration curves, you will determine the concentrations of the acidic solutions as well as the acidionization constant of a weak acid. 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. Answer any questions posed in the manuals procedure steps for the experiment in question in the order that they appear. Measurements using comparison methods are capable of a high degree of accuracy because the result obtained does not depend. Experiment 18 chem 10 general chemistry iilab studocu. Potentiometer mechanics manufactured goods free 30day trial. You can think of a long wire as several short segments of wire that are connected in series.
The known voltage may be supplied by a standard cell or any other known voltage reference source. During titration, the data was obtained by monitoring the change in ph instead of using visual indicators to determine the endpoint. Potentiometer, leclanche cell or dry cell, an ammeter, one resistance box rbox 1 about 050. A typical set up for potentiometric titrations is given in figure 2. It is designed to facilitate interaction with the physical world via sensors. For instance, a temperature sensor in an oven often consists of a resistor with a resistance that increases with temperature. The purpose of this experiment is to measure the electromotive force emf and internal resistance of a dry cell. With the dial of the pot facing you and the legs pointing down, what is the. Determine the expected vout, based on your measurements of the applied voltages, the total potentiometer resistance, rbot, and rtop. And also it is used to compare emfs of different cells. Discuss reasons for the difference between the expected vout match and the measured vout. Lab manual iii sem page 6 experiment 2 experiment name.
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