Why is AC current better at long distances than DC?
**AC power can easily be transformed to a very high voltage.** * By the equation P = U*I we see an increase in voltage (U) must lead to a decrease in current (I) for the same power (P). * With Ohms law I = U / R, we can calculate the power loss in a resistance (the cable) as: P_loss = R / (U²) o…
The Short Answer
**AC power can easily be transformed to a very high voltage.** * By the equation P = U*I we see an increase in voltage (U) must lead to a decrease in current (I) for the same power (P). * With Ohms law I = U / R, we can calculate the power loss in a resistance (the cable) as: P_loss = R / (U²) or P_loss = R * I². In both forms in the second statement, we see it's beneficial to increase the voltage, and reduce the current. AC transformers exactly do this. DC transformers exist, but are still more expensive and harder to manufacture.
Analysis
Key Concepts: Power, voltage, loss
This explanation focuses on power, voltage, loss and spans 100 words across 5 sentences. At 41% above the average Nature explanation (71 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.
What This Answer Covers
The explanation opens with: “**AC power can easily be transformed to a very high voltage.** * By the equation P = U*I we see an increase in voltage “ It then elaborates by presenting a contrasting perspective, ultimately building toward a complete picture across 5 connected points.
How This Compares in Nature
Ranked #120 of 500 Nature questions by answer depth (top 25%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.
Frequently Asked Questions
Is there a simple explanation for why ac current better at long distances than dc?
**AC power can easily be transformed to a very high voltage.** * By the equation P = U*I we see an increase in voltage (U) must lead to a decrease in current (I) for the same power (P). * With Ohms law I = U / R, we can calculate the power loss in…
How detailed is this explanation compared to similar Nature questions?
This is one of the most thorough answer at 100 words, ranked #120 of 500 Nature questions by depth. The key concepts covered are power, voltage, loss.
What approach does this answer take to explain ac current better at long distances than dc?
The explanation uses contrasting perspectives across 100 words. It is categorized under Nature and addresses the question through 1 analytical lens.