17 (c) (i)
This power station transmits 500 MW of electrical power through the National Grid at a voltage of 100 000 V. Calculate the current in the power lines. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... answer ......................................... A
(ii)
[2]
Other power stations with the same power output use a higher voltage of 200 000 V. Explain why this is a good idea. ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2]
Š OCR 2012
Turn over for the remainder of question 10