Question

Answer 1

a. \(\left\{{}\begin{matrix}U2=U-U1=12-9=3V\\I=I1=I2=P1:U1=4,5:9=0,5A\end{matrix}\right.\)

\(\Rightarrow R2=U2:I2=3:0,5=6\Omega\)

Số chỉ Ampe kế: 0,5A

b. \(A=UIt=12\cdot0,5\cdot15\cdot60=5400\left(J\right)\)

d. \(R2=p2\dfrac{l2}{S2}\Rightarrow l2=\dfrac{R2\cdot S2}{p2}=\dfrac{6\cdot0,1\cdot10^{-6}}{0,4\cdot10^{-6}}=1,5\left(m\right)\)