# UMass Amherst PHYSICS 132 - COMPL Phys 132 Lab 5 - DC Circuits (11 pages)

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## COMPL Phys 132 Lab 5 - DC Circuits

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- Pages:
- 11
- School:
- University of Massachusetts Amherst
- Course:
- Physics 132 - Intro Physics II

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Physics 132 Lab Lab 5 DC Circuits Experimental Design and Modeling Connect the red wire from the PASCO 550 power supply to the red post of the 100 ohm resistor Connect the black wire from the PASCO 550 power supply to the black post of the 100 ohm resistor now you have a circuit The power supply measures the amount of current through the circuit Connect the red and black wires from channel A of the PASCO 550 to the red and black posts of the 100 ohm resistor respectively Channel A will measure the voltage applied across the resistor Use the PASCO Capstone software to measure the voltage and current for the resistor 1 Record about 10 measurements of voltage and current for the the resistor Your measurements should range from 5V to 5V Record measurements in spreadsheet provided Resistor 1 Current A Voltage V 0 05168 4 975 0 04133 3 979 0 03097 2 984 0 02064 1 989 0 01028 0 993 0 01042 0 997 0 02077 1 991 0 03111 2 986 0 04146 3 982 0 05182 4 976 Now that you have taken a set of measurements of voltage and current for the resistor let s try to figure something about the resistor Is there a pattern between the voltage across and current through a resistor How can we understand what the pattern is The pattern is that as voltage increases so does the current This means the two have a direct relationship We can understand what the pattern is by graphing the values we recorded and seeing their relationship 2 Make a graph of voltage vs current for the resistor Make sure the voltage is plotted on the y axis vertical and current is plotted on the x axis horizontal 3 Describe the relationship between voltage and current for the resistor Explain a mathematical model for the relationship What are the parameters in the model you would use and how do the parameters relate to properties of the resistor For the resistor there is a positive linear relationship between the current and voltage This means that as the current increases the voltage also increases The parameters are slope 96 1 and y intercept 0 00534 In relationship to the resistor the slope is equivalent to the resistance of the resistor in ohms The y intercept would be equal to the voltage when current is equal to zero Now connect the red and black wires from channel A to the red and black post of the second resistor 4 Record about 10 measurements of voltage and current for the second resistor Your measurements should range from 5V to 5V Record measurements in spreadsheet provided Resistor 2 Current A Voltage V 0 05159 4 975 0 04128 3 979 0 03093 2 984 0 02062 1 989 0 01027 0 993 0 01042 0 996 0 02076 1 991 0 03107 2 986 0 04141 3 982 0 05175 4 976 5 Make

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