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. The voltage between the resistor terminals is 80V.
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:

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

Try another example