Ok. I'll show you the question and hopefully I've gone in the right direction.
A power line supplies electrical energy to a transformer in a manufacturing plant.
The input voltage to the transformer is 11,000V. The transformer changes this to 415V for use in the manufacturing plant. The power input to the transformer is 800kW.
i. Calculate the current in the secondary coil of the transformer, stating any assumptions you have made about the transformer.
I_p V_p = I_s V_s
The Attempt at a Solution
Assuming 100% efficency in the transformer.
x / 415 = 800,000 / 11,000
x = 30.181 (3dp) kW
I think I'm using the right equation but have I got my units mixed up?