a ,
ta có :
\(R_{tđ}=\dfrac{R_1R_2}{R_1+R_2}=\dfrac{24.8}{24+8}=6\left(\Omega\right)\)
b.
ta có :
\(I=\dfrac{U}{R_{tđ}}=\dfrac{12}{6}=2\left(A\right)\)
vì \(R_1//R_2\)
\(\Rightarrow I=I_1=I_2=2\left(A\right)\)
a. \(\dfrac{1}{R_{tđ}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\)
=> Rtđ = \(\dfrac{R_1.R_2}{R_1+R_2}=\dfrac{24.8}{24+8}=\dfrac{192}{32}=6\)Ω