calculate heat produced when 80000 coulombs of charge is transferred in 1/2 hour through a potential difference of 40 volts

1 volt = 1 joule per coulomb40 volts = 40 joules per coulomb(40 joules per coulomb) x (80,000 coulombs) = 3.2 million joules of energy.How fast or slow it happens is irrelevant.