An industrial spot welder uses a step-down transformer connected to the AC mains supply to deliver the extremely high currents needed to fuse sheet metal.
The table below shows the specifications and measurement data for this spot welder's transformer:
| Parameter | Value |
|---|---|
| Number of turns on the primary coil | 800 |
| Number of turns on the secondary coil | 5 |
| Potential difference across the primary coil | 240 V |
| Current in the secondary coil | 320 A |
Calculate the potential difference across the secondary coil of this transformer.
Calculate the current drawn by the primary coil from the mains supply, assuming the transformer operates at 100% efficiency.
16 exam-style questions on OCR GCSE Physics Uses of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.