Plusivo DM501D - Example

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
8.6.1 Example
To measure the internal resistance of a 9 V battery, we need to measure the voltage of the
battery first.
The measured voltage in this figure is 8.95 V DC.
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Mastering the Art of Measurement (DM501D Digital Multimeter) r.01 www.plusivo.com