Physics Electromagnetic Induction PMDC 2020
PMDC Verified Question 62 of 69
In transmission from grid station, power losses are minimized by:
A
Increasing current
B
Decreasing current
C
Increasing resistance
D
Increasing voltage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Increasing voltage
Concept:

Power loss in transmission lines is primarily due to Joule heating.

Formula:

$$ P_{\text{loss}} = I^2 R $$

Solution:

  • To transmit a given amount of power (\( P = VI \)), if the transmission voltage (\( V \)) is increased, the current (\( I \)) is proportionally decreased.


  • Since power loss scales with the square of the current (\( I^2 \)), minimizing current by stepping up the voltage drastically reduces energy losses during long-distance transmission.


Why other options are incorrect:

Increasing current exponentially increases heat loss. Increasing resistance also increases loss. Decreasing current is a result of increasing voltage, but stepping up the voltage at the grid station is the primary action taken.

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