Question

Calculate the equivalent resistance between the points A and B in the figure if each resistance is $2.0\Omega$.

Answer 1

Let the equivalent of the $2\Omega$ resistors connected in parallel be R.

$\frac{1}{R}=\frac{1}{2}+\frac{1}{2}=1\Rightarrow R=1\Omega$

Now, as all the resistors are connceted in series,

$R_{eq}=2+2+1=5\Omega$