4.1.1 Energy changes in a system, and the ways energy is stored before and after such changes, 4.1.2 Conservation and dissipation of energy, 4.1.3 National and global energy resources...
6.1.1 Energy changes in a system, and the ways energy is stored before and after such changes, 6.1.2 Conservation and dissipation of energy, 6.2.1 Current, potential difference and resistance...
Topic 1 - Energy - 1.1-Energy Changes In A System, Topic 1 - Energy - 1.2-Conservation and Dissipation of Energy, Topic 1 - Energy - 1.3 National and Global Energy Resources...