74. A 1.40-Ω resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 8.30 V. Find the internal resistance of the battery.

We can current from

 

 

Ok, now solve for Rinternal

 

 

 

 

 

 

 

 

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This page last updated on June 18, 2018