A) how much emf is delivered but the battery above when it delivers a current of 20 A? (b) how much of this power is delivered to the starter? (c) by how much does the chemical energy of the battery decrease when it delivers a current of 20 A to the starter for 3 min? (d) how much heat is developed in the battery when it delivers a current of 20 A for 3 min?
12 - Vr = 11.4 => Vr=0.6 V Vr is the voltage drop across the internal resistor
R = ...
This solution calculates internal resistance of a battery and the emf delivered when it delivers a given current.