The table below shows parameters for a step-down transformer used in an electrical substation.
| Parameter | Value |
|---|---|
| Potential difference across primary coil | 275 000 V275\,000\text{ V}275000 V |
| Current in secondary coil | 2500 A2500\text{ A}2500 A |
| Potential difference across secondary coil | 33 000 V33\,000\text{ V}33000 V |
Assuming the transformer is 100%100\%100% efficient, calculate the current in the primary coil of the transformer.