Plusivo DM401B - Measuring Internal Resistance of a Battery

8.6 Measuring Internal Resistance of a Battery
We need to follow these steps to measure the internal resistance of a battery using the
multimeter. First, we need to measure the voltage of the battery.
Second, we connect a resistor with the battery and measure its voltage.
Third, we will do some calculations using Ohm’s law.
● Calculate the current passing through the resistor:
𝑅
𝑉
𝑅
= 𝐼
● Subtract the voltage of the battery from the voltage on the resistor:
𝐵
𝑉
− 𝑅
𝑉
= 𝐵
𝑅𝑉
● Now, we have the current and the voltage on the internal resistance, so we can calculate the
value of the internal resistor:
𝑉
𝐼
= 𝐼
𝐵𝑅
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Mastering the Art of Measurement (DM401B Smart Digital Multimeter) r.01 www.plusivo.com