Spec J249
Revise OCR GCSE Physics Power and efficiency with the question bank, lessons, revision guides, and flashcards.
Define power as the rate at which energy is transferred and use examples to explain this definition. • Recall and use the equation: power (watt, W) = work done (joule, J) ÷ time taken (second, s); P = E ÷ t. • Recall that one watt is equal to one joule per second, J/s.
