Question

Answer 1

a. \(R=\dfrac{R1\cdot R2}{R1+R2}=\dfrac{8\cdot8}{8+8}=4\Omega\)

b. \(I=U:R=24:4=6A\)

\(A=UIt=24\cdot6\cdot20\cdot60=172800\left(J\right)\)

Answer 2

\(R_{tđ}=\dfrac{R_1\cdot R_2}{R_1+R_2}=\dfrac{8\cdot8}{8+8}=4\Omega\)

\(A=UIt=24\cdot\dfrac{24}{4}\cdot20\cdot60=172800J\)