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Electricity is transferred across step-up transformers to ...

... increase its potential difference for transmission from power stations

Or

... increase its potential difference for domestic use

Or

... increase its current for transmission from power stations

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Answer:

Assuming that a transformer is 100 per cent efficient, the following equation can be used to calculate the power output from the transformer: A step-down transformer converts 11 500 V into 230 V ...

Explanation:

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