Post-UTME Physics 2019 Objective — Question 6
Question 6 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
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For long distance transmission of electrical power, the voltage is stepped up in order to (reduce the current and hence minimize I^2R power loss in the transmission wires)
- A. reduce current and power loss in the transmission wiresCorrect
- B. increase the resistance in the wire proportionately to the potential difference
- C. increase the rate of electrical consumption
- D. increase the current for brighter lights
Explanation
Stepping up the voltage for a given power reduces the current needed, which reduces I^2R (resistive/heat) power losses in the long transmission wires. (Note: option A's exact wording was cut off in the scan but is the physically correct completion; options B-D are incorrect.)
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