A step-down transformer is integrated into a modern smart-home installation to safely step down the voltage supply to an LED lighting controller, as illustrated below:
Identify the material typically used to construct the core of the transformer and explain the physical property that makes it suitable for this purpose.
Determine the current in the secondary coil when the power output delivered to the LED lighting controller is 23 W23\text{ W}23 W. Assume that the transformer operates at 100%100\%100% efficiency.
Induced potential, transformers and the National Grid (physics only) (HT only) Questions
Practise AQA GCSE Physics Induced potential, transformers and the National Grid (physics only) (HT only) with exam-style questions for Foundation and Higher tier. 15 questions covering Induced potential (HT only), Uses of the generator effect (HT only), Microphones (HT only), and Transformers (HT only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.