The effective resistance of a parallel connection that consists of...

Let the resistance of each wire be $R$

Effective resistance in parallel combination,

${R}_{P} = \dfrac{R}{4}$

$⇒ R = 4{R}_{P}$

$⇒ R = 4 \times 0 . 25 = 1Ω$

Effective resistance is series combination,

${R}_{S} = 4R$

$⇒ {R}_{s} = 4 \times 1 = 4Ω$