Combination of Resistors: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Combination of Resistors. Understanding the underlying formula is key to arriving at the correct answer below:

For 4 identical wires in parallel, $R_p = \frac{R}{4} = 0.25\ \Omega \implies R = 1 \Omega$.
Connected in series, $R_s = 4 R = 4 \times 1 = 4 \Omega$.