When a 6.0 V battery is being charged by a current of 2.0 A , the potential difference across its terminals is 7.2 V . Determine the internal resistance of the battery.

Step-by-step solution

During the charging of a battery, the terminal potential difference V is given by the equation: V = E + Ir where E is the emf of the battery, I is the charging current, and r is the internal resistance. Given values are: V = 7.2 V E = 6.0 V I = 2.0 A Substituting the given values into the equation: 7.2 = 6.0 + 2.0r 2.0r = 1.2 r = 1.2 2.0 = 0.6