GCSE Science: Physics: How to calculate efficiency

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A handy guide to working out efficiency from five minute physics. Perfect for science and physics GCSE, IGCSE, or high school physics. This exactly matches the AQA specification, but will be great whichever exam board you are with. Watch it all the way through, and we're sure this video will help.
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Imagine if you could actually take a hot air balloon to school. That would be amazing!

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