IGCSE Physics / Electric motors and electromagnetic induction
Transformer calculations
Edexcel International GCSE Physics (4PH1), chapter 21: Electric motors and electromagnetic induction, specification point 6.19P, 6.20P. Part of the full course.
Read the revision notes · IGCSE Physics past papers
Transformer calculations use the turns equation to relate coil turns to voltage, and the power equation to find current in a 100% efficient transformer. Keeping primary values on top and checking whether the result should increase or decrease helps you avoid errors.