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:

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

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