Potential Difference: 4.2 C Charge & 4.5 MJ Energy Boil/Vaporize

[Mhchurch4]

A lightning flash transfers 4.2 C of charge and 4.5 MJ of energy to the Earth.

(a) Across what potential difference did it travel?

(b) How much water could this boil and vaporize, starting from room temperature?

 

[rock.freak667]

Right right...What do you think you need to do for the first part, well rather how do you think you need to do it?