Same answer chain

Use this to connect the question's starting point to the final result.

step-up transformer increases the potential difference

For the same power transfer, the current in the transmission cables is reduced

Lower current causes less heating or energy/power loss in the cables

Reduced cable losses make the transfer more efficient

Current question

Explain how using step-up transformers makes the network efficient.

These resources explain how the links cause the effect and how examiners award marks.

Try writing an answer using the chain first, then check it against the model and checklist.

1 The step-up transformer increases the potential difference.
2 For the same power transfer, the current in the transmission cables is reduced.
3 Lower current causes less heating or energy/power loss in the cables.
4 Reduced cable losses make the transfer more efficient.

Common weak answer: Names the topic but skips the middle reasoning links.