Measuring Internal Resistance of Batteries
Contributors:
Shawn Hymel
Shawn Hymel 
Take Voltage Measurements
Measurement Sheet
Create a table for recording voltages:
| Voltages | 330 Ω Load | 10k Ω Load | Open Circuit |
| Lemon Battery |
330 Ω Load
Touch the negative probe (black wire in the picture) to the anode (nail/screw) on the battery, and touch the positive probe (red wire in the picture) to the cathode (penny) terminal on the battery. Record the voltage under "330 Ω Load."
NOTE: If you are using a multimeter for this exercise, we recommend using something like alligator test leads to hold the resistor across the electrodes of the battery.
10k Ω Load
Replace the 330 Ω resistor with a 10k Ω. Repeat the process to measure the voltage across the battery. Record the voltage under "10k Ω Load."
Open Circuit Voltage
Remove the resistor from the breadboard and take another measurement. Record the voltage under "Open Circuit."
