Transformers and the national grid

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Question 7
Easy

An industrial step-down transformer at a manufacturing plant is connected to a high-voltage mains supply.

The potential difference across the primary coil = 11 000 V11\,000\text{ V}11000 V.

The potential difference across the secondary coil = 440 V.

The current in the secondary coil is 650 A.

Calculate the current in the primary coil.

Use the equation:

current in primary=potential difference across secondary×current in secondarypotential difference across primary \text{current in primary} = \frac{\text{potential difference across secondary} \times \text{current in secondary}}{\text{potential difference across primary}} current in primary=potential difference across primarypotential difference across secondary×current in secondary​
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Transformers and the national grid Questions

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