Year 11 GCSE (Higher) ELECTRICITY FOR GADGETS OCR Gateway Science Suite Lessons 9-10 (P6e) 1) …changing field in the primary coil of a transformer induces an output voltage in the secondary coil 2) …isolating transformers, have equal number of turns in the primary and secondary coils and limit the risk of contact between live parts and the earth lead 3) …equation: VpIp = VsIs
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