http://www.bbc.co.uk/education/guides/zhhcwmn/revision/4
Source: http://www.bbc.co.uk/education/guides/zhhcwmn/revision/4
Short video covering electrical power for AQA GCSE Physics P1 3.2
Source: Mr R Pepperell: http://www.knowmia.com/watch/lesson/20319