How do they work? How can pupils explain energy loss (e.g. masts/satellites/wires)? How can they compare to another familiar example (e.g. Sky tv)? How can they describe energy transfers happening in another machine, e.g. fibre optic cables? This is an assessed task, and I have just copied (and translated) some of the key points. I was hoping you could help me. I have some ideas, but as a non physicist I want to make sure I'm on the right track. Thanks.