Exam-style question
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How does a transformer improve the efficiency of power transmission?.
- A.By increasing the resistance in the circuit.
- B.By reducing the voltage to prevent overload.
- C.By increasing the voltage which reduces current and energy loss.
- D.By converting AC to DC for better transmission.
Model answer
What a good answer should say
- By increasing the voltage which reduces current and energy loss.
Explanation
Why this works
A transformer improves the efficiency of power transmission by increasing the voltage, which in turn reduces the current flowing through the transmission lines. This mechanism decreases the energy lost as heat due to resistance in the wires.
The consequence is that more electrical energy reaches the end users, making the system more efficient.
Common mistake
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