Electricity question on the power generated by power stations.

[Delpo]

Homework Statement

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

Homework Equations

P=W/t=VQ/t=VI
V=IR
R=VI

The Attempt at a Solution

Can type my working out sorry.

 

[gneill]

Homework Statement

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

Homework Equations

P=W/t=VQ/t=VI
V=IR
R=VI

The Attempt at a Solution

Can type my working out sorry.

We don't know how to help if you don't show your attempt...

 

[voko]

We can't help you unless we can see you have tried to solve it.

 

[DrZoidberg]

Are you sure you copied that text correctly? It seems to contain several errors. For example it should be 0.034Ω/km, not 0.034Ωk/m.
So each km of conductor has a resistance of 0.034Ω. The current is 15kA.
Now you just have to apply your equations.
V=IR
P=VI