a. \(\dfrac{U_1}{U_2}=\dfrac{n_1}{n_2}\Rightarrow U_2=\dfrac{U_1\cdot n_2}{n_1}=\dfrac{1000\cdot50000}{500}=100000V\)
b. \(P_{hp}=R\cdot\dfrac{P^2}{U^2}=150\cdot\dfrac{600000^2}{100000^2}=5400\)W
c. Ta có: \(\dfrac{U_1}{U_2}=\dfrac{n_1}{n_2}\Rightarrow U_2=\dfrac{U_1\cdot n_2}{n_1}=\dfrac{1000\cdot1000000}{500}=1000000V\)
Vậy HĐT tăng 100 lần thì công suất hao phí giảm 10000 lần