Experiment 1: Ohm’s LawIn this experiment, you will apply Ohm’s Law to investigate the relationship between voltage, resistance and current.Materials4 AA Batteries2 Alligator ClipsDigital MultimeterMasking TapePermanent Marker 1kΩ Resistor from Snap Circuit KitRulerProcedure1. Prepare the digital multimeter by insertingthe black cord into the “COM” port andthe red cord into the “VΩmA” port in thebottom right corner. You will be usingmultiple functions of the multimeter. Thetwo main sections you will be using in thisprocedure are “DCV” located in the topleft and “DCA” located on the right and“Ω” located on the bottom right (Figure 3).2. Turn the multimeter on using the switchunder 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. 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 © 2014 eScience Labs, LLC.All Rights Reserved Figure 3: Multimeter set up.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 thenegative 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 thebattery. 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. 19. Remove the alligator clips from the battery, resistor, and multimeter. © 2014 eScience Labs, LLC.All Rights Reserved20. 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 CombinationsBattery Combination Voltage (V) Current (A)1 1.62 0.001551 and 2 3.24 0.00311 1, 2 and 3 4.87 0.004661, 2, 3 and 4 6.49 0.00621Table 3: Resistor DataResistance (Ω) Slope (V/A) Percent Difference1026 1 5%Post-Lab Questions1. 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 Reserved3. 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. Law5. Use the results of your experiment to verify Ohm’s Law.© 2014 eScience Labs, LLC.All Rights