Đáp án:
câu 3
a.22000V
b.2500W
câu 4
a. N2>N1⇒máy tăng thế
b.$100000\left( V \right)$
c.$500000\left( {\rm{W}} \right)$
Giải thích các bước giải:
câu 3
$\begin{array}{l}
a.\frac{{{U_2}}}{{{U_1}}} = \frac{{{N_2}}}{{{N_1}}} \Rightarrow \frac{{{U_2}}}{{1000}} = \frac{{11000}}{{500}} \Rightarrow {U_2} = 22000\left( V \right)\\
b.\Delta P = \frac{{{P^2}R}}{{{{\left( {U\cos \varphi } \right)}^2}}} = \frac{{{{\left( {110000} \right)}^2}.100}}{{{{\left( {22000} \right)}^2}}} = 2500\left( {\rm{W}} \right)
\end{array}$
câu 4:
a. N2>N1⇒máy tăng thế
$\begin{array}{l}
b.\frac{{{U_2}}}{{{U_1}}} = \frac{{{N_2}}}{{{N_1}}} \Rightarrow \frac{{{U_2}}}{{2000}} = \frac{{20000}}{{400}} \Rightarrow {U_2} = 100000\left( V \right)\\
c.\Delta P = \frac{{{P^2}R}}{{{{\left( {U\cos \varphi } \right)}^2}}} = \frac{{{{\left( {{{5.10}^6}} \right)}^2}.200}}{{{{\left( {{{10}^5}} \right)}^2}}} = 500000\left( {\rm{W}} \right)
\end{array}$
