Exam-style question
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Explain why transformers are useful in power transmission.
Model answer
What a good answer should say
- Transformers are useful in power transmission because they can increase or decrease voltage levels.
- By using a step-up transformer, the voltage is increased for long-distance transmission, which reduces current and minimizes energy loss due to heat in the wires.
- This efficient transmission allows electricity to be delivered over vast distances with less energy wasted.
Explanation
Why this works
This answer is strong because it clearly identifies the cause (transformers increasing or decreasing voltage), explains the mechanism (reducing current to minimize energy loss), states the effect (efficient transmission), and concludes with the consequence (less energy wasted over long distances). The question tests understanding of the practical applications of transformers in electrical systems.
Common mistake
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