https://www.youtube.com/watch?v=4_m47GO8bnc&index=41&list=PLBlnK6fEyqRgLR-hMp7wem-bdVN1iEhsh here power should have been negative .i.e. -70W
https://www.youtube.com/watch?v=4_m47GO8bnc&index=41&list=PLBlnK6fEyqRgLR-hMp7wem-bdVN1iEhsh here power should have been negative .i.e. -70W