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YouTubeCognito
GCSE Physics - Efficiency | Energy & Power (2026/27 exams)
⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The concept of efficiency in energy transfers. * The difference between useful energy output and wasted energy. * Why devices are not 100% efficient. 2. How to calculate the efficiency of a device. * The formula for efficiency using energy input and useful ...
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