In this experiment, students use the Xplorer GLX to derive the relationship between voltage and current in a circuit.

• Microsoft Word version of this lab:
  
  • ohmslawGLX_docs.zip (3.8 MB)

• Xplorer GLX (PS-2002)
• Voltage-Current Sensor (PS-2115)
• Short Patch Cords (SE-7123)
• Alligator Clip Leads (EM-8634)
• Battery Holder
• Resistor (between 10-1000 Ohms)

Using the chart above, determine the given resistance of your resistor.

1. Press the Start Button.


2. Record the value of the current and voltage in the Data Table below.


3. Press the Stop Button.

4. Place another battery into the Battery Holder for a total of 2 batteries. Connect the leads as in the picture above.


5. Repeat steps 1-3.

6. Place another battery into the Battery Holder for a total of 3 batteries. Connect the leads as in the picture above.


7. Repeat steps 1-3.

8. Place another battery into the Battery Holder for a total of 4 batteries. Connect the leads as in the picture above.


9. Repeat steps 1-3.

Data Table

Batteries	I (A)	V (V)
1
2
3
4

1. Using graph paper or a spread sheet, graph the values from the Data Table.


2. Determine the slope of your graph.


3. Determine the vertical intercept of your graph.


4. Write an equation that relates the voltage to the current.

1. The ratio of the voltage over the current is referred to as the resistance. Compare this value to the value of your slope. What is the percent difference?


2. What is the physical meaning of the slope from your graph?


3. What is the physical meaning of the vertical intercept from your graph?


4. If a 4 V battery replaced the battery that was used in the experiment, what current would the Current Sensor measure?


5. In another circuit, a 330 Ohm resistor is connected to a battery. If 0.50 A is measured in the circuit, what voltage is across the battery?