1. Using the battery equation, explain why a battery's terminal voltage decreases when the external load resistance it is connected to decreases.
2. A car won't start. The car owner connects a voltmeter across the battery terminals, and the voltmeter reads 12 volts, just like a "good" battery. However, when the car is taken to an auto repair shop, their voltage test shows the battery voltage has dropped well below 12 volts, and they correctly conclude the battery is "bad." Using the battery equation, discuss what must have been different about the battery test performed at the auto shop.

I am having trouble understanding these statements and how to prove them.I know that the second one has to do with internal resistance