An experiment to verify ohm’s law
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This document summarizes an experiment conducted by Vania Lundina to verify how the length of a conductor affects its resistance according to Ohm's Law. The experiment involved measuring the resistance of copper wires of varying lengths (10-35 cm) using a voltmeter, ammeter, and power supply. The results showed that resistance increased with increasing length, supporting the conclusion that resistance is directly proportional to length as predicted by Ohm's Law. Some variability between trials was attributed to inaccuracies in measuring wire length.
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An Experiment to Verify Ohm's Law
This document summarizes an experiment conducted by Vania Lundina to verify how the length of a conductor affects its resistance according to Ohm's Law. The experiment involved measuring the resistance of copper wires of varying lengths (10-35 cm) using a voltmeter, ammeter, and power supply. The results showed that resistance increased with increasing length, supporting the conclusion that resistance is directly proportional to length as predicted by Ohm's Law. Some variability between trials was attributed to inaccuracies in measuring wire length.
Lab report 2
This document summarizes an experiment to verify Ohm's law and analyze resistive circuits. The experiment has two parts: 1) Develop a voltage-current characteristic curve for a resistor to verify Ohm's law. Measure voltage and current at increasing voltage levels and plot the relationship. 2) Determine voltages and currents in series and parallel resistor circuits using voltage and current divider rules. Measure voltages across individual resistors in series to verify calculations match measurements.
Ohm's law
The document reports on an experiment to verify Ohm's Law by measuring the current and voltage in circuits with known resistors. Two resistors were tested (R1 = 11.2Ω, R2 = 21.1Ω). Measurements were taken using a voltmeter, ammeter, and ohmmeter. The data was plotted and linear fits confirmed Ohm's Law. Slopes from the plots matched the resistor values to within measurement error, verifying Ohm's Law.
Phys 102 formal simple dc circuits lab report
In this lab experiment, the student built both series and parallel circuits containing three resistors each to investigate the relationships between resistance, potential difference, and current. For the series circuit, the student found that the current remains the same throughout while the potential difference varies across each resistor. For the parallel circuit, the current varies across each resistor while the potential difference remains the same. The student's measurements matched well with theoretical calculations, validating the circuit concepts.
Resistance Applied
The document outlines an experiment to measure how the resistance of a wire changes with its length. It provides instructions on setting up a circuit to measure the current and voltage across wires of different lengths. Students are asked to record their results in a table, calculate the resistance at each length, and plot a graph of resistance versus length. They then analyze whether the graph shows a direct or inverse relationship between resistance and length and explain why this occurs based on the fundamental relationship between resistance and resistivity.
Elestrical Conduction
This document discusses Ohm's law, which states that current is directly proportional to voltage and inversely proportional to resistance. It provides the equations for calculating current, voltage, and resistance in series and parallel circuits. It also discusses resistivity, conductivity, conductance, and the differences between electronic and ionic conduction in materials. As an example, it shows the calculation of resistance for a copper wire when its diameter is reduced while maintaining the same length and resistivity.
Series Resistance Combinations
This document discusses series resistance combinations. It explains that the total resistance of resistors connected in series is calculated by summing the individual resistances. Current must pass through each resistor in a series circuit. Voltage is conserved and drops across each resistor according to Ohm's Law. Examples are provided to illustrate series and non-series resistor connections. Additional references and a related YouTube video are also referenced.
Circuit problem
This document discusses finding the equivalent resistance of a circuit with both series and parallel resistors. It provides the formulas for calculating equivalent resistance of series resistors as the sum of individual resistances, and of parallel resistors as the inverse of the sum of the inverses of individual resistances. The document then works through an example circuit, calculating the equivalent resistances of components in series and parallel and arriving at a final equivalent resistance of 14.44 ohms for the overall circuit.
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An Experiment to Verify Ohm's Law
This document summarizes an experiment conducted by Vania Lundina to verify how the length of a conductor affects its resistance according to Ohm's Law. The experiment involved measuring the resistance of copper wires of varying lengths (10-35 cm) using a voltmeter, ammeter, and power supply. The results showed that resistance increased with increasing length, supporting the conclusion that resistance is directly proportional to length as predicted by Ohm's Law. Some variability between trials was attributed to inaccuracies in measuring wire length.
Lab report 2
This document summarizes an experiment to verify Ohm's law and analyze resistive circuits. The experiment has two parts: 1) Develop a voltage-current characteristic curve for a resistor to verify Ohm's law. Measure voltage and current at increasing voltage levels and plot the relationship. 2) Determine voltages and currents in series and parallel resistor circuits using voltage and current divider rules. Measure voltages across individual resistors in series to verify calculations match measurements.
Ohm's law
The document reports on an experiment to verify Ohm's Law by measuring the current and voltage in circuits with known resistors. Two resistors were tested (R1 = 11.2Ω, R2 = 21.1Ω). Measurements were taken using a voltmeter, ammeter, and ohmmeter. The data was plotted and linear fits confirmed Ohm's Law. Slopes from the plots matched the resistor values to within measurement error, verifying Ohm's Law.
Phys 102 formal simple dc circuits lab report
In this lab experiment, the student built both series and parallel circuits containing three resistors each to investigate the relationships between resistance, potential difference, and current. For the series circuit, the student found that the current remains the same throughout while the potential difference varies across each resistor. For the parallel circuit, the current varies across each resistor while the potential difference remains the same. The student's measurements matched well with theoretical calculations, validating the circuit concepts.
Resistance Applied
The document outlines an experiment to measure how the resistance of a wire changes with its length. It provides instructions on setting up a circuit to measure the current and voltage across wires of different lengths. Students are asked to record their results in a table, calculate the resistance at each length, and plot a graph of resistance versus length. They then analyze whether the graph shows a direct or inverse relationship between resistance and length and explain why this occurs based on the fundamental relationship between resistance and resistivity.
Elestrical Conduction
This document discusses Ohm's law, which states that current is directly proportional to voltage and inversely proportional to resistance. It provides the equations for calculating current, voltage, and resistance in series and parallel circuits. It also discusses resistivity, conductivity, conductance, and the differences between electronic and ionic conduction in materials. As an example, it shows the calculation of resistance for a copper wire when its diameter is reduced while maintaining the same length and resistivity.
Series Resistance Combinations
This document discusses series resistance combinations. It explains that the total resistance of resistors connected in series is calculated by summing the individual resistances. Current must pass through each resistor in a series circuit. Voltage is conserved and drops across each resistor according to Ohm's Law. Examples are provided to illustrate series and non-series resistor connections. Additional references and a related YouTube video are also referenced.
Circuit problem
This document discusses finding the equivalent resistance of a circuit with both series and parallel resistors. It provides the formulas for calculating equivalent resistance of series resistors as the sum of individual resistances, and of parallel resistors as the inverse of the sum of the inverses of individual resistances. The document then works through an example circuit, calculating the equivalent resistances of components in series and parallel and arriving at a final equivalent resistance of 14.44 ohms for the overall circuit.
Resistor combinations
This document discusses the combination of resistors in series and parallel circuits and how to calculate the total resistance. It provides the equations for calculating total resistance for resistors in series (Rtotal = R1 + R2) and parallel (1/Rtotal = 1/R1 + 1/R2). Several example calculations are shown applying these equations to circuits with 2-3 resistors in both series and parallel combinations.
Ohms law
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Ohm's law, resistors in series or in parallel
This document provides information about resistors in series and parallel circuits. It defines that in a series circuit, the same current flows through all resistors but the voltage drops across each resistor are different. The total resistance is calculated by adding the individual resistances. In a parallel circuit, the same voltage is applied across all resistors but the current through each resistor is different. The total resistance is calculated using the reciprocal of the sum of the reciprocals of the individual resistances. Formulas for calculating total and individual current and voltage values are also provided.
Electrical Resistance in Series and Parallel Circuit
This lab report summarizes an experiment on electrical resistance in series and parallel circuits. Resistors with values of 660Ω, 250Ω and 130Ω were connected in series and parallel to a power supply varying from 2V to 10V. The total resistance was calculated for each circuit and compared to theoretical values. The results obtained from experimental data had errors below 20% compared to theory, demonstrating the concepts of series and parallel resistance.
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This document summarizes an experiment on Ohm's Law and finding the resistance of unknown resistors. In part A, the resistance was held constant at 100 ohms while the voltage was varied from 3V to 12V to measure current. Then voltage was held at 10V while resistance was varied to measure current. The measured values aligned well with theoretical calculations using Ohm's Law. In part B, resistors of varying values were used in series and the current and reciprocal of current were measured and graphed. The graph's slope provided the resistance and the y-intercept was zero, confirming Ohm's Law. Minor differences between measured and theoretical values were due to factors like resistor degradation over multiple uses.
Sample lab
This lab report describes an experiment measuring resistance in series circuits. The student built circuits with two and three resistors connected in series and measured the total resistance. Calculations using Ohm's law and Kirchhoff's voltage law found the total resistance to be within 0.022-0.11% of measured values, showing the calculations accurately modeled the physical circuits. Tables in the report show the individual resistor values, calculated and measured total resistances, and percent differences between calculations and measurements.
To verify ohom's law
1. The document describes an experiment to verify Ohm's Law, which states that the current through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance.
2. The experiment involves setting up a circuit with a resistor and voltage source, measuring the current and voltage at different resistances, and showing that a linear relationship exists between current and voltage.
3. The results show that the ratio of voltage to current remains nearly constant at different measurements, and a graph of current versus voltage produces a straight line as expected from Ohm's Law, verifying it experimentally.
Week 2
This document discusses bridge circuits and their use in instrumentation and measurements. It describes how bridge circuits like the Wheatstone bridge use a null detection or null balancing principle to measure unknown components. The key advantages of bridge circuits are their high accuracy due to comparison-based measurements and independence from input voltage or source impedance. The document outlines various types of DC and AC bridges, providing examples like the Wheatstone, Kelvin, and Maxwell bridges. It also discusses bridge measurement techniques, sources of error, applications, and the use of bridges in control systems.
Sample lab-report on verfication of ohms law
This laboratory report summarizes an experiment to verify Ohm's Law. The experiment used resistors with values of 1.0kΩ and 1.2kΩ in various circuit configurations. Measurements were made of voltage, current, and resistor values using a digital multimeter. The results closely matched the expected theoretical values based on Ohm's Law. This confirmed that Ohm's Law accurately describes the relationship between voltage, current, and resistance in electrical circuits. The experiment also verified the resistor color code system and that total resistance in a series circuit equals the sum of individual resistances.
Electric measurements class 12
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ELECTRONICS 10: CURRENT QUIZ ANSWERS
This document contains an electrical circuitry worksheet with multiple choice questions, true/false questions, and short answer/problem solving questions testing knowledge of concepts like current, voltage, resistance, conductors, insulators, Ohm's Law, and circuits. Some of the questions covered include: defining current as a stream of moving electrons, identifying materials that offer little resistance, factors that affect resistance, properties of alternating current, units of measurement like amps and ohms, formulas like Ohm's Law, and calculating values like current or voltage given other circuit parameters.
Lab 02 Resistor color coding and ohms law
1. This document describes an experiment to identify resistor color codes and verify Ohm's Law. It includes objectives, equipment, procedures, and questions.
2. The first part explains how to determine a resistor's value and tolerance from its color bands. Tables list the color codes used in 4-band and 5-band resistors.
3. The second part tests Ohm's Law by measuring the current through resistors under different voltages. A circuit is assembled and current is measured both ways through each resistor to verify the relationships defined by Ohm's Law.
LAB report basic dc meter design
This lab aimed to design basic DC meters to measure current and voltage. For the ammeter, the resistance of the meter movement was found to be 344.68 Ω. Using this value, a shunt resistor of 14.37 Ω was calculated. Testing showed the designed ammeter had an average error of 1.815% compared to a multimeter. A voltmeter was also designed using a meter movement and 49,655 kΩ resistor, which tested with an average 6.06% error. Finally, voltage dividers were analyzed theoretically and with the designed voltmeter, showing close agreement.
Polytechnic of namibia ...
This lab report summarizes two experiments measuring resistance and voltage. In the first experiment, the resistance of three resistors was calculated from color codes and measured with a multimeter, finding errors within 5%. The second experiment measured voltages from a power supply at increasing levels, finding small discrepancies between the power supply and multimeter readings due to internal resistance converting energy. Overall, the lab demonstrated that calculating resistance from color codes is reasonably accurate and introduced concepts of resistance, voltage measurement, and energy conversion in circuits.
Physices lab ohm's law
This lab experiment aims to verify Ohm's law by measuring resistance in series and parallel circuits. Resistors R1 and R2 are connected in different circuits and the current and voltage are measured. The resistance is calculated from Ohm's law and by finding the slope of the I-V graph. The measured resistances are then compared to theoretical values to see if they satisfy Ohm's law for series and parallel circuits. A report is made with the data sheet, graphs, discussion and percentage error calculation.
Lecture Notes: EEEC6430312 Measurements And Instrumentation - Instrumentation
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Using batteries, bulbs, and an ammeter in a series circuit, the current was measured and found to be _. Voltages across individual bulbs were measured to be _ V and _ V. Bulb resistances were calculated using Ohm's Law. The total resistance of both bulbs was _ ohms. Using the measured current and total resistance in Ohm's Law, the predicted total voltage was calculated to be _. The actual total voltage measured across the batteries was _.
Unit 103 power_point_8_resistors_series
When resistors are connected in series, the current can only flow through one path. The total resistance of a series circuit equals the sum of the individual resistances. The current at any point in the circuit is the same. The voltage across each resistor depends on its resistance and the current flowing through it. The total voltage supplied by the battery equals the sum of the voltages across each resistor. The total power equals the sum of the power dissipated by each resistor.
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The document describes an experiment using a circuit construction kit simulation to measure current and voltage in a parallel circuit with two light bulbs. Key steps include:
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2) Measuring the voltage across each bulb and using this to calculate the resistance of each bulb.
3) Calculating the total resistance of the two bulbs and using Ohm's Law to predict the total voltage, then measuring the actual total voltage.
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This document discusses various methods for measuring medium resistances between 1-0.1M Ω. It describes four common methods: the voltmeter-ammeter method, substitution method, ohmmeter method, and bridge circuit method. The bridge circuit method operates on the principle of null comparison using a Wheatstone bridge configuration with ratio and standard arms. Sources of error in resistance measurements include thermal EMF and contact resistance. Worked examples are provided to calculate resistance values and measurement uncertainties.
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Resistor combinations
This document discusses the combination of resistors in series and parallel circuits and how to calculate the total resistance. It provides the equations for calculating total resistance for resistors in series (Rtotal = R1 + R2) and parallel (1/Rtotal = 1/R1 + 1/R2). Several example calculations are shown applying these equations to circuits with 2-3 resistors in both series and parallel combinations.
Ohms law
Dear student, Cheap Assignment Help, an online tutoring company, provides students with a wide range of online assignment help services for students studying in classes K-12, and College or university. The Expert team of professional online assignment help tutors at Cheap Assignment Help .COM provides a wide range of help with assignments through services such as college assignment help, university assignment help, homework assignment help, email assignment help and online assignment help. Our expert team consists of passionate and professional assignment help tutors, having masters and PhD degrees from the best universities of the world, from different countries like Australia, United Kingdom, United States, Canada, UAE and many more who give the best quality and plagiarism free answers of the assignment help questions submitted by students, on sharp deadline. Cheap Assignment Help .COM tutors are available 24x7 to provide assignment help in diverse fields - Math, Chemistry, Physics, Writing, Thesis, Essay, Accounting, Finance, Data Analysis, Case Studies, Term Papers, and Projects etc. We also provide assistance to the problems in programming languages such as C/C++, Java, Python, Matlab, .Net, Engineering assignment help and Finance assignment help. The expert team of certified online tutors in diverse fields at Cheap Assignment Help .COM available around the clock (24x7) to provide live help to students with their assignment and questions. We have also excelled in providing E-education with latest web technology. The Students can communicate with our online assignment tutors using voice, video and an interactive white board. We help students in solving their problems, assignments, tests and in study plans. You will feel like you are learning from a highly skilled online tutor in person just like in classroom teaching. You can see what the tutor is writing, and at the same time you can ask the questions which arise in your mind. You only need a PC with Internet connection or a Laptop with Wi-Fi Internet access. We provide live online tutoring which can be accessed at anytime and anywhere according to student’s convenience. We have tutors in every subject such as Math, Chemistry, Biology, Physics and English whatever be the school level. Our college and university level tutors provide engineering online tutoring in areas such as Computer Science, Electrical and Electronics engineering, Mechanical engineering and Chemical engineering. Regards http://www.cheapassignmenthelp.com/ http://www.cheapassignmenthelp.co.uk/
Ohm's law, resistors in series or in parallel
This document provides information about resistors in series and parallel circuits. It defines that in a series circuit, the same current flows through all resistors but the voltage drops across each resistor are different. The total resistance is calculated by adding the individual resistances. In a parallel circuit, the same voltage is applied across all resistors but the current through each resistor is different. The total resistance is calculated using the reciprocal of the sum of the reciprocals of the individual resistances. Formulas for calculating total and individual current and voltage values are also provided.
Electrical Resistance in Series and Parallel Circuit
This lab report summarizes an experiment on electrical resistance in series and parallel circuits. Resistors with values of 660Ω, 250Ω and 130Ω were connected in series and parallel to a power supply varying from 2V to 10V. The total resistance was calculated for each circuit and compared to theoretical values. The results obtained from experimental data had errors below 20% compared to theory, demonstrating the concepts of series and parallel resistance.
Long report fizik
This document summarizes an experiment on Ohm's Law and finding the resistance of unknown resistors. In part A, the resistance was held constant at 100 ohms while the voltage was varied from 3V to 12V to measure current. Then voltage was held at 10V while resistance was varied to measure current. The measured values aligned well with theoretical calculations using Ohm's Law. In part B, resistors of varying values were used in series and the current and reciprocal of current were measured and graphed. The graph's slope provided the resistance and the y-intercept was zero, confirming Ohm's Law. Minor differences between measured and theoretical values were due to factors like resistor degradation over multiple uses.
Sample lab
This lab report describes an experiment measuring resistance in series circuits. The student built circuits with two and three resistors connected in series and measured the total resistance. Calculations using Ohm's law and Kirchhoff's voltage law found the total resistance to be within 0.022-0.11% of measured values, showing the calculations accurately modeled the physical circuits. Tables in the report show the individual resistor values, calculated and measured total resistances, and percent differences between calculations and measurements.
To verify ohom's law
1. The document describes an experiment to verify Ohm's Law, which states that the current through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance.
2. The experiment involves setting up a circuit with a resistor and voltage source, measuring the current and voltage at different resistances, and showing that a linear relationship exists between current and voltage.
3. The results show that the ratio of voltage to current remains nearly constant at different measurements, and a graph of current versus voltage produces a straight line as expected from Ohm's Law, verifying it experimentally.
Week 2
This document discusses bridge circuits and their use in instrumentation and measurements. It describes how bridge circuits like the Wheatstone bridge use a null detection or null balancing principle to measure unknown components. The key advantages of bridge circuits are their high accuracy due to comparison-based measurements and independence from input voltage or source impedance. The document outlines various types of DC and AC bridges, providing examples like the Wheatstone, Kelvin, and Maxwell bridges. It also discusses bridge measurement techniques, sources of error, applications, and the use of bridges in control systems.
Sample lab-report on verfication of ohms law
This laboratory report summarizes an experiment to verify Ohm's Law. The experiment used resistors with values of 1.0kΩ and 1.2kΩ in various circuit configurations. Measurements were made of voltage, current, and resistor values using a digital multimeter. The results closely matched the expected theoretical values based on Ohm's Law. This confirmed that Ohm's Law accurately describes the relationship between voltage, current, and resistance in electrical circuits. The experiment also verified the resistor color code system and that total resistance in a series circuit equals the sum of individual resistances.
Electric measurements class 12
,kirchhoff's laws ,potentiometer ,application of potentiometer ,meter bridge ,application of meter bridge ,emf and potential difference
ELECTRONICS 10: CURRENT QUIZ ANSWERS
This document contains an electrical circuitry worksheet with multiple choice questions, true/false questions, and short answer/problem solving questions testing knowledge of concepts like current, voltage, resistance, conductors, insulators, Ohm's Law, and circuits. Some of the questions covered include: defining current as a stream of moving electrons, identifying materials that offer little resistance, factors that affect resistance, properties of alternating current, units of measurement like amps and ohms, formulas like Ohm's Law, and calculating values like current or voltage given other circuit parameters.
Lab 02 Resistor color coding and ohms law
1. This document describes an experiment to identify resistor color codes and verify Ohm's Law. It includes objectives, equipment, procedures, and questions.
2. The first part explains how to determine a resistor's value and tolerance from its color bands. Tables list the color codes used in 4-band and 5-band resistors.
3. The second part tests Ohm's Law by measuring the current through resistors under different voltages. A circuit is assembled and current is measured both ways through each resistor to verify the relationships defined by Ohm's Law.
LAB report basic dc meter design
This lab aimed to design basic DC meters to measure current and voltage. For the ammeter, the resistance of the meter movement was found to be 344.68 Ω. Using this value, a shunt resistor of 14.37 Ω was calculated. Testing showed the designed ammeter had an average error of 1.815% compared to a multimeter. A voltmeter was also designed using a meter movement and 49,655 kΩ resistor, which tested with an average 6.06% error. Finally, voltage dividers were analyzed theoretically and with the designed voltmeter, showing close agreement.
Polytechnic of namibia ...
This lab report summarizes two experiments measuring resistance and voltage. In the first experiment, the resistance of three resistors was calculated from color codes and measured with a multimeter, finding errors within 5%. The second experiment measured voltages from a power supply at increasing levels, finding small discrepancies between the power supply and multimeter readings due to internal resistance converting energy. Overall, the lab demonstrated that calculating resistance from color codes is reasonably accurate and introduced concepts of resistance, voltage measurement, and energy conversion in circuits.
Physices lab ohm's law
This lab experiment aims to verify Ohm's law by measuring resistance in series and parallel circuits. Resistors R1 and R2 are connected in different circuits and the current and voltage are measured. The resistance is calculated from Ohm's law and by finding the slope of the I-V graph. The measured resistances are then compared to theoretical values to see if they satisfy Ohm's law for series and parallel circuits. A report is made with the data sheet, graphs, discussion and percentage error calculation.
Lecture Notes: EEEC6430312 Measurements And Instrumentation - Instrumentation
This document discusses thermistors and the Wheatstone bridge circuit. It begins by explaining that thermistors are temperature dependent resistors used for temperature sensing. It then discusses the Steinhart-Hart equation used to relate resistance and temperature for NTC thermistors. Finally, it explains how the Wheatstone bridge circuit can be used to measure unknown resistances by balancing the bridge.
student - series circuit
Using batteries, bulbs, and an ammeter in a series circuit, the current was measured and found to be _. Voltages across individual bulbs were measured to be _ V and _ V. Bulb resistances were calculated using Ohm's Law. The total resistance of both bulbs was _ ohms. Using the measured current and total resistance in Ohm's Law, the predicted total voltage was calculated to be _. The actual total voltage measured across the batteries was _.
Unit 103 power_point_8_resistors_series
When resistors are connected in series, the current can only flow through one path. The total resistance of a series circuit equals the sum of the individual resistances. The current at any point in the circuit is the same. The voltage across each resistor depends on its resistance and the current flowing through it. The total voltage supplied by the battery equals the sum of the voltages across each resistor. The total power equals the sum of the power dissipated by each resistor.
parallel circuit
The document describes an experiment using a circuit construction kit simulation to measure current and voltage in a parallel circuit with two light bulbs. Key steps include:
1) Building a parallel circuit with two light bulbs and measuring the total current and current through each bulb.
2) Measuring the voltage across each bulb and using this to calculate the resistance of each bulb.
3) Calculating the total resistance of the two bulbs and using Ohm's Law to predict the total voltage, then measuring the actual total voltage.
Resistance Measurement instruments
This document discusses various methods for measuring medium resistances between 1-0.1M Ω. It describes four common methods: the voltmeter-ammeter method, substitution method, ohmmeter method, and bridge circuit method. The bridge circuit method operates on the principle of null comparison using a Wheatstone bridge configuration with ratio and standard arms. Sources of error in resistance measurements include thermal EMF and contact resistance. Worked examples are provided to calculate resistance values and measurement uncertainties.
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Electrical Resistance in Series and Parallel Circuit
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Lecture Notes: EEEC6430312 Measurements And Instrumentation - Instrumentation
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An experiment to verify ohm’s law
- 1. Verifying the Effect of Length of a conductor to the Resistance Vania Lundina – 11 Science According to Ohm’s Law, the resistance of a conductor depends on its material. From the formula R = L / A, we can conclude that the resistance of a conductor is directly proportional to its length, and is inversely proportional to the cross-sectional area of the conductor itself. The aim of this experiment is to verify the effect of length of a conductor to its resistance. My hypothesis would be the longer the material, the bigger the resistance and the greater the cross-sectional area of the material, the lower the resistance would be. The independent variable is the length and thickness of the conductor. The dependent variable is the voltmeter and ammeter reading to find the resistance, and the controlled variable is the V from the power supply and the thickness of the wire. My experiment diagram would look like this: A V = Resistance wire
- 2. The materials needed are: 1. Resistance wires of 10 cm, 15 cm, 20 cm, 25 cm, 30 cm and 35 cm. 2. Connecting wires. 3. Crocodile clips. 4. A voltmeter. 5. An ammeter. 6. A power supply. Procedures: 1. Set up the circuit with a 10 cm resistance wire like the diagram shown above. 2. Turn the power supply on; set it into 3 V. 3. Check the reading on the ammeter and voltmeter. 4. Measure the resistance of the resistance wire using the formula V = I R. 5. Do the same step for the resistances wire 15 cm, 20 cm, 25 cm, 30 cm and 35 cm. In doing this experiment, the accuracy of the length of resistance wire must be considered. To avoid any unexpected or inaccurate data, the experiment will be repeated 3 times. I will take the average of the three data.
- 3. Result in table form: No. Length of Ammeter Voltmeter Resistance Ave. Resistance Reading/A Reading/V from R/ wire/cm R = V/I TRIAL 1 2 3 1 10 1,8 1,3 1,6 0,7 0,7 1,0 2 15 1,5 1,6 1,1 0,9 0,9 1,0 3 20 1,4 1,7 1,2 1,2 1,2 1,2 4 25 1,2 1,8 1,5 1,5 1,5 1,5 5 30 1,1 2,0 1,8 1,9 1,7 1,7 6 35 1,0 2,1 2,1 2,1 1,9 2,0 Analysis and conclusion: Some data form my first, second and third trial showed different readings of ampere and volt. This difference might be caused by the inaccuracy of the length of the resistance wire. But the average value somehow proves the formula R = L / A, where the length of the resistance wire does affect the resistance of the conductor. So my conclusion is, the longer the wire, the bigger the value of resistance would be.