Transformers
3 guided lessons · 27 checks · 6. Magnetism and Electromagnetism → Electromagnetic Induction
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Transformer structure and the alternating requirement
A transformer is two coils sharing an iron core: the primary takes the input voltage, the secondary delivers the output, and the core carries the changing field between them. It rescales an alternating voltage — bigger or smaller by the turns ratio — and only alternating works, because a steady field through the secondary would induce nothing.
What you know already
Two coils, one iron core, and an alternating input: the transformer rescales an alternating voltage by the turns ratio. This note builds the structure, sorts step-up from step-down, and follows the pair out onto the National Grid, where high voltage means cool cables.
Key points of understanding
- A transformer has a primary coil, a secondary coil and a shared iron core.
- The primary coil is connected to the input alternating voltage.
- The changing field in the core threads the secondary coil and induces its output.
- A transformer rescales the size of an alternating voltage.
- A steady direct input induces nothing in the secondary.
Structure of a transformer
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1.Transformer structure and the alternating requirement
A transformer is two coils sharing an iron core: the primary takes the input voltage, the secondary delivers the output, and the core carries the changing field between them. It rescales an alternating voltage — bigger or smaller by the turns ratio — and only alternating works, because a steady field through the secondary would induce nothing.
Structure of a transformer
Key points
- A transformer has a primary coil, a secondary coil and a shared iron core.
- The primary coil is connected to the input alternating voltage.
- The changing field in the core threads the secondary coil and induces its output.
Guided content from the SME authoring corpus — note rn_jzHmr535CQnZvdWC, pinned at 6312d659ec0d · promoted SyllabAI/syllabai-resources b3caaaa90c5e
