TRANSFORMERS AND NATIONAL GRIDS

4 marks · Normal

Draw a labelled diagram of a transformer. Include the following labels: primary coil, secondary coil, soft iron core, input (AC supply), and output.

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Must show: Rectangle (soft iron core), Primary coil (label), Secondary coil (label), Input (AC supply), Output

Common mistakes: Omitting core or coils; Failing to label

Show mark scheme and worked solution

Marking points

D1 · 1 mark · Soft iron core (rectangle or similar, labelled)

D2 · 1 mark · Primary coil (labelled, wrapped around one side)

D3 · 1 mark · Secondary coil (labelled, wrapped around the other side)

D4 · 1 mark · Input (AC supply) and output correctly labelled

Worked solution

Labelled diagram of a transformer

Include labels for input (AC supply, at the primary coil) and output (from the secondary coil).