Here are some power point slides from my resources for AQA GCSE Core Physics. You also have some revision questions and the whole set of lessons is based around the multichoice paper. Although this specification is shortly becoming obsolete you can very easy take slides out for other parts of courses lower or higher if you are making a series of lessons! NB: these are non-profit resources.
Core Physics p1a Electrical Energy
Core Physics p1a Heat Transfer