Measuring Internal Resistance of Batteries
Take Voltage Measurements
Create a table for recording voltages:
|Voltages||330 Ω Load||10k Ω Load||Open Circuit|
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."
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."