Introduction to Electrical Circuits
In this experiment you will be asked to make observations, explain them, and record your multi-meter readings in the data table
DATA TABLE:
Resistance based on color bands:_________?; %uncertainty ______(from color band)
DMM-Measured Resistance ___________ ?
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Measured Voltage (V)
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Measured Current (A)
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Calculated R =
V/I
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1.5V battery
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3V battery
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4.5 V battery
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Calculations and Graphing: For each of the three previous procedures calculate the resistance from the measured current and voltage: R = V/I. Remember that the units have to be volts, amperes, and ohms; i.e. if you recorded your current in mA, you must convert to A (divide by 1000) for the results to be in ohms.
1. Use an xy scatter graph to graph voltage on the y-axis versus current on the x-axis.
2. Use the linear fit trendline function of Excel® to add the slope of the line to the graph.
3. What is the significance of the slope?
4. How do the graph and the slope of the line relate to Ohm's law?
5. Can this series of experiments be considered a verification of Ohm's law? Why or why not?