6.6 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 Ohmβs law.
β Calculate the current passing through the resistor:
π
π
π
= πΌ
β Subtract the voltage of the battery from the voltage on the resistor:
π΅
π
β π
π
= π΅
π
π
β Now, we have the current and the voltage on the internal resistance, so we can
calculate the value of the internal resistor:
π
πΌ
= πΌ
π΅π
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