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:_________Ω; %uncertainty ______(from color band)
DMM-Measured Resistance ___________ Ω
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Measured Voltage (V) |
Measured Current (A) |
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.
- Use an xy scatter graph to graph voltage on the y-axis versus current on the x-axis.
- Use the linear fit trendline function of Excel® to add the slope of the line to the graph.
- What is the significance of the slope?
- How do the graph and the slope of the line relate to Ohm’s law?
- Can this series of experiments be considered a verification of Ohm’s law? Why or why not?
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