A lightning flash transfers 8.0 C of charge and 8.5 MJ of energy to the Earth.
i) Between what potential difference did it travel?
ii) How much water could this boil, starting from temperature of 20.0 Degree Celcius? (Given c of water = 4186.0 J/kg C, Latent heat of fusion: 2.256 x 10^6 J/kg)