Resistor

Resistor 1 with a resistance of 100 Ohms and resistor 2 with a resistance of 400 Ohms are connected side by side in the circuit. There is a voltage of 80V between the resistor terminals.
a) Draw a circuit diagram and write the entered quantities in it
b) Find the resulting resistance of the resistors.
c) Find the current I passing through the unbranched part of the circuit

Correct answer:

R =  80 Ω
I =  1 A

Step-by-step explanation:

$$\begin{gathered} R_1=100\Omega \\ {R}_2=400\Omega \\ U=80\text{V} \\ {I}_1=U/R_1=80/100=\frac{4}{5}=0.8\text{A} \\ {I}_2=U/R_2=80/400=\frac{1}{5}=0.2\text{A} \\ I=I_1+I_2=\frac{4}{5}+\frac{1}{5}=\frac{4+1}{5}=\frac{5}{5}=1\text{A} \\ R=U/I=80/1=80\Omega \end{gathered}$$

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