OCR 21st Century Physics GCSEWatch
What did people get for the kettle question? I decided it wasn't worth the time for just 1 mark as i was pressed for time so guessed 4 minutes. Everyone i asked guessed so i'm not sure what it was...
Kettle: 7 minutes. Had to be, because the kettle was 170 watts, so 0.17kW. 0.17kW x 420 seconds (7 minutes) approximately equals 70, which was the amount of kilojoules needed to boil the water.