Đáp án:
\(\Delta {P_{hp}} = 450000W\)
Giải thích các bước giải:
\(\begin{array}{l}
{P_{hp}} = \frac{{{P^2}R}}{{{U^2}}} = \frac{{{{100000000}^2}.20}}{{{{500000}^2}}} = 800000W\\
{P_{hp}}' = \frac{{{P^2}R}}{{U{'^2}}} = \frac{{{{100000000}^2}.20}}{{{{400000}^2}}} = 1250000W\\
\Delta {P_{hp}} = {P_{hp}}' - {P_{hp}} = 1250000 - 800000 = 450000W
\end{array}\)