1. The problem statement, all variables and given/known data 2)The power stations providing electricity for the National Grid generate electricity at 25kV. The typical demand on an average winter's day in the north-west of England is 6000MW. The current output form the generators is 240kV. Transformers raise the transmission voltage to 400kV. Assuming 100% efficiency in the transformers, the current is 15kA. Each pair of 400kV supergrid conductors has a resistance of 0.034Ωk/m. How much power is lost per kilometre heating the conductors? Books answer:7.65MW 2. Relevant equations P=W/t=VQ/t=VI V=IR R=VI 3. The attempt at a solution Can type my working out sorry.