Tóm tắt:
$R=5\,\,\left( \Omega  \right)$
${{P}_{hp}}=0,5\,\,\left( kW \right)=500\,\,\left( W \right)$
$U=10\,\,\left( kV \right)\,=10000\,\,\left( V \right)$
$P=?\,\,\left( W \right)$
……………………………….
 
Giải:
$\,\,\,\,\,\,\,{{P}_{hp}}=R\,.\,\dfrac{{{P}^{2}}}{{{U}^{2}}}$
 
$\to {{P}^{2}}=\dfrac{{{U}^{2}}\,.\,{{P}_{hp}}}{R}$
 
$\to P=\sqrt{\dfrac{{{U}^{2}}\,.\,{{P}_{hp}}}{R}}$
 
$\to P=\sqrt{\dfrac{{{10000}^{2}}\,.\,500}{5}}$
 
$\to P=100000\,\,\left( W \right)$