Exam-style question
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What happens to the current when a transformer steps up the voltage?.
- A.The current increases to maintain power.
- B.The current decreases to maintain power.
- C.The current remains constant.
- D.The current becomes zero.
Model answer
What a good answer should say
- The current decreases to maintain power.
Explanation
Why this works
When a transformer steps up the voltage, the current decreases to maintain the same power level, as power is the product of voltage and current. This mechanism ensures that less current flows through the transmission lines, reducing energy losses due to resistance.
The consequence is that the system operates more efficiently over long distances.
Common mistake
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