Question

A circuit 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 total equivalent resitance of the

circuit?

Answer 1

The total equivalent resistance

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