High Voltage Minimizes Power Loss by Reducing Current

Steps:

• Electrical power P equals voltage V times current I, so for constant P, increasing V decreases I.
• Power loss in cables follows I²R, where R is resistance; lower I reduces loss quadratically.
• High-voltage transmission thus lowers both current and resistive heating losses.
• This efficiency justifies high-voltage systems for long-distance power delivery.

Why D is correct:

• By Ohm's law and P = VI, high V yields low I for fixed P, minimizing I²R losses per Joule's law.

Why the others are wrong:

• A: Power loss is low (not high) due to reduced I.
• B: Current is low (not high) with high V.
• C: Neither loss nor current is high; both decrease.

Final answer: D