The BBC’s “Bang Goes The Theory” Human Power Station

This ought to be required viewing for everyone over the age of (say) ten years, and it seems to be a reasonably mature and (almost) patronisation-free approach to the subject.
If you miss it on the BBC’s website, and they may show it again on TV, there might be another way of “obtaining it” – I couldn’t possibly comment.
I think the neatest part of the show was a demonstration of how the waste heat from two 40 Watt incandescent light bulbs is sufficient to cook a small chicken in 90 minutes.

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