Transformer power formula
The transformer power formula as it is used in GCSE Physics, taken from the GCSE Physics formula sheet.
The formula
How to use it in the exam
- Write the formula down before substituting — most mark schemes award a method mark for a correct, clearly quoted formula.
- Check every quantity is in consistent units before you substitute, then substitute in one step so the working stays easy to follow.
- Show the rearrangement rather than jumping to the answer, and give the final value to the accuracy the question asks for.
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