Question

A circular has a resistor with a resistance of 3Ω followed by three parallel branches each holding a resistor with a resistance of 5Ω. What is the equivalent resistance of the circuit?

Answer 1

The equivalent resistance of the circuit

$$R_{eq}=R_1+\frac{R_2}{3}\\ =3\:\Omega+\frac{5\:\Omega}{3}=4.7\:\Omega$$