Question

Answer 1

Bài 5:

\(\left\{{}\begin{matrix}I1=P1:U1=100:220=\dfrac{5}{11}A\\I2=P2:U2=75:220=\dfrac{15}{44}A\end{matrix}\right.\)

Vì \(I1>I2\Rightarrow\) đèn 1 sáng hơn.

Answer 2

Bài 4:

\(U2=U-U1=9-6=3V\left(R1ntR2\right)\)

\(I=I1=I2=\dfrac{P1}{U1}=\dfrac{3}{6}=0,5A\left(R1ntR2\right)\)

\(\Rightarrow P2=U2.I2=3.0,5=1,5\)W