Experiment 1: Ohm’s Law
In this experiment, you will apply Ohm’s Law to investigate the relationship between voltage,
resistance and current. Materials 4 AA Batteries
2 Alligator Clips
Digital Multimeter
Masking Tape
Permanent Marker 1kΩ Resistor from Snap Circuit Kit
Ruler Procedure
1. Prepare the digital multimeter by inserting
the black cord into the “COM” port and
the red cord into the “VΩmA” port in the
bottom right corner. You will be using
multiple functions of the multimeter. The
two main sections you will be using in this
procedure are “DCV” located in the top
left and “DCA” located on the right and
“Ω” located on the bottom right (Figure 3).
Figure 3: Multimeter set up. 2. Turn the multimeter on using the switch
under the dial.
3. Turn the dial of the multimeter until the arrow points to the “20” in “DCV”.
4. Tear off four square pieces of masking tape from the roll and place one on each
battery. Use the permanent marker to label the batteries 1 - 4.
5. Tear off a 20 cm long piece of masking tape and set the non-sticky side down on the
table.
6. Place Battery 1 on the masking tape such that the positive side of Battery 1 is located
at the left end of the length of masking tape.
© 2014 eScience Labs, LLC.
All Rights Reserved 7. Use the multimeter to measure the voltage of Battery 1 by touching the metal probe
of the red cord to the positive side of the battery and the metal probe of the black
cord to the negative side of the battery. Record the voltage in Table 2.
Note: Reversing the cords and battery ends causes the multimeter to read a negative
voltage.
8. Place Battery 2 on the masking tape so that the positive side of Battery 2 to touches
the negative side of Battery 1 (Figure 4). Use the multimeter to measure the voltage
of Battery 1 and 2. Record the voltage in Table 2. Figure 4: Battery diagram. 9. Place Battery 3 on the masking tape so that the positive side of Battery 3 to
touches the negative side of Battery 2. Use the multimeter to measure the
voltage of Battery 1, 2, and 3. Record the voltage in Table 2.
10. Place Battery 4 on the masking tape so that the positive side of Battery 4 to
touches the negative side of Battery 3. Use the multimeter to measure the
voltage of Battery 1, 2, 3 and 4. Record the voltage in Table 2.
11. Remove Batteries 2, 3, and 4 from the masking tape.
12. Turn the dial of the multimeter so the arrow points to the “20m” in the “DCA”.
The “m” stands for the suffix “milli”.
13. Use one alligator clip to connect the positive side of Battery 1 to one end of
the 1kΩ resistor.
14. Use the other alligator clip to connect the other side of the resistor to the red
probe of the multimeter.
15. Touch the metal probe of the black multimeter cord to the negative side of the
battery. You have now completed a circuit and should have an electric current
reading on your multimeter. Record the current in Table 2. Since the scale is in
milliamps, you will need to convert your number to amps (1 amp = 1000
milliamps)
16. Add battery 2 as you did in step 8 and repeat steps 15. Record the current in
Table 2.
17. Add battery 3 as you did in step 9 and repeat steps 15. Record the current in
Table 2.
18. Add battery 4 as you did in step 10 and repeat steps 15. Record the current in
Table 2.
© 2014 eScience Labs, LLC.
All Rights Reserved 19. Remove the alligator clips from the battery, resistor, and multimeter.
20. Turn the dial on the multimeter to “2000” in the “Ω” section. Place the red
and black probe on opposite sides of the resistor to measure its resistance.
Record this value in Table 3. Table 2: Voltage Readings of Different AA Battery Combinations
Battery Combination Voltage (V) Current (A) 1
1 and 2
1, 2 and 3
1, 2, 3 and 4 Table 3: Resistor Data
Resistance (Ω) Slope (V/A) Percent Difference Post-Lab Questions
1. Plot a graph of Table 2. Consider which variable (voltage or current) should be on the
x and y axes. 2. What is the relationship between voltage and current? Use data from your graph to
support your answer. © 2014 eScience Labs, LLC.
All Rights Reserved 3. Estimate the slope of the linear line and record it in Table 3. 4. How does the value of the slope compare to the resistance you measured? Calculate
the percent difference.
1.
2.
3.
4. Law
5. Use the results of your experiment to verify Ohm’s Law. © 2014 eScience Labs, LLC.
All Rights Reserved

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