Question

Có tóm tắt ạ

Answer 1

Tóm tắt:

\(U=220V\)

\(A=990000\left(J\right)=275\left(Wh\right)\)

\(t=15p=0,25h\)

a. I = ?A

b. R = ?\(\Omega\)

Giải:

a. \(A=UIt\Rightarrow I=\dfrac{A}{Ut}=\dfrac{275}{220.0,25}=5\left(A\right)\)

b. \(R=\dfrac{U}{I}=\dfrac{220}{5}=44\left(\Omega\right)\)