Question: If you could please do all the charts i would appreciate it!! this is the only other sheet that came with this assignment Then the





Then the cross sectional area of the wire can be calculated using the equation of the area of a circle: In this experiment, you will measure V and I to determine R for various lengths of wire. You will then make a graph of Resistance (Y-axis) verses length (X-axis). The plot will result in a straight line that has a slope equal to (6) From equation 6 , it is possible to solve the resistivity in terms of the slope and the cross sectional area: The manufacture values of the resistivity corresponding to the wires used in the experiment are reported in Table 1. These values will be used as the theoretical when calculating percent error. Table 1. Theoretical resistivity of different materials according to manufacturer. Date Moudfied 0800/2] Part 1 - Resistance vs Length 1. Find the four yellow brass wires. Select the wire with the largest diameter and set the other three wires to the side. 2. Find the diameter of the brass wire you just selected in Table 1 and record this value in Data Table 1. 3. Ask a Lab Instructor to demonstrate how to properly place the wire in the resistance apparatus. 4. Open the appropriate computer software for your experiment. 5. Click on the upper tab corresponding to Part 1 and Part 2 . 6. Set the distance between the reference probe and the slider probe to 24cm. Then monitor the voltage and current for five seconds. Record the mean values for the voltage and curreat on Data Table 1. 7. Reduce the distance between the reference probe and the slider probe by 2cm and monitor again for five seconds recording the mein values for the voltage and current on Data Table 1 . 8. Repcat step seven until you reach a length of 2cm. Part 2- Diameter vs Resistivity 1. Find the other three yellow brass wires that you set aside for Part 1. On this part of the cxperiment, you will use the four brass wires. 2. Record the diameter for each wire in the Data Table 2. Make sure also to include the wire used on Part 1. You will find these values in Table I. 3. Place the thinnest wire in the resistance apparatus and set the distance between the reference probe and theslider probe to 24cm. 4. Monitor the voltage and current for five seconds. Record the mean voltage and current on Data Table 2. 5. Repeat steps 34 for the remaining brass wires. For the wire with the largest Part 3- Resistivity of Different Materials 1. Click on the upper tab corresponding to Part 3. 2. Find the remaining three wires (two gey and one red). 3. Record the diameter of the wires in Data Table 3. You will find these values in Table 1 . 4. Place one of the wires in the resistance apparatus and set the distance between the reference probe and the slider probe to 24cm. 5. Monitor the voltage and current for five seconds. Record the mean voltage and current on Data Table 3 . 6. Repeat steps 3-5 for the remaining two wires. Part 1 - Resistance vs Length 1. Caleulate the cross sectional area of the wire using equation 5 . 2. Using Ohm's law, cquation 2, calculate the resistance of the wire for each length. 3. Construct a graph using excel with the resistance as a function of length. 4. Using the slope and the calculated cross sectional area, calculate the resistivity of the wire. Use equation 7. 5. Compare the calculated resistivity with the theoretical value reported in Table 1 to find the percent error. Part 2- Diameter vs Resistivity 1. Calculate the cross sectional area of each wire using equation 5 . 2. Using Ohm's law, equation 2 , calculate the resistance for each wire. 3. Using the equation for resistivity, equation 4 , calculate the resistivity for each wire. 4. Calculate the mean and standard deviation for resistivity. 5. Compare the mean of the resistivity with the theoretical value for brass reported in Table. I and calculate the percent error. Part 3- Resistivity of Different Materials 1. Calculate the cross sectional arca of each wire tuing equation 5 . 2. Using Ohm's law, equation 2, calculate the resistance for each wire. 3. Using the equation for resistivity, equation 4, calculate the resistivity for each wire. 4. Use the theoretical values for resistivity from Tabie 1 to figare out the material of each wire. You will do this by comparing the calculated and the theoretical resistivity, Once you recognize the material of each wire, calculate the corresponding percent errors. Table 1-Resistance vs Length Diameter of wire: Cross Sectional Area of wire: Slope of graph Resistance vs Length: Calculated Resistivity from slope: Theoretical Resistivity: Percent Error: Table 2 - Resistivity vs Diameter Length of wire: Mean of Resistivity: Standard Deviation of Resistivity; Data Sheet: E5a: Resistivity of Different Materials NAME: DATE: Table 3 - Resistivity of Different Materials Length of the wires: Discussion: Ohm's Law describes the relationship between the resistance (R) of a wire, the voltage drop across it (V), and current through it (T): Applying a known current to a wire and measuring the voltage across it will let you determine the resistance of the wire by solving equation 1: The resistance of a particular element depends on its geometry, the resistivity and the temperature. Resistivity is the tendency of the material to behave as a resistor and is an inherent property of a material, in the same sense that density or thermal expansion are inherent propertics. Materials with lower resistivity, like copper, are good conductors of electricity and widely used in circuit components while those with larger recistivity, like rubber, are used as insulators. For a wire with length (L), cross-sectional area (A), and made from a material with resistivity () the resistance (R) will be given by the following equation: (3) In case that the geometry (fength and cross sectional area) and the resistanoe of the wire is known, then is possible to calculate the resistivity solving equation 3: A wire can be consider as a long cylinder, then the cross sectional area would bave a circular shane as shown in Figure 2. Date B Rod fed 0809/21
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