Meritnation experts last time i did not understand your ans Kindly ans again I need handwritten ans in a sheet of paper as I have eye problem so kindly ans only in a sheet of paper This question I have headache Issues so kindly ans in a sheet of paper with proper explanation and examples so I can understand but I need in A sheet of paper only plz ans also why we use Kwh in energy i meant commercial unit not Joules this is also my doubt????? Why we use KWH WHY NOT JOULES??? Plz ans in a paper this time only