Transformers and the national grid

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Question 6
Easy

A step-up transformer is used at a power station to prepare electricity for transmission across the National Grid.

Diagram of a step-up transformer with a laminated iron core. The primary coil has 400 turns, an input potential difference of 25,000 V, and an input current of 80 A. The secondary coil has 6,400 turns, an output potential difference of 400,000 V, and an output current of 5 A.

Calculate the value of the following ratio for the transformer shown above:

number of turns on the secondary coilnumber of turns on the primary coil \frac{\text{number of turns on the secondary coil}}{\text{number of turns on the primary coil}} number of turns on the primary coilnumber of turns on the secondary coil​
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Transformers and the national grid Questions

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