Question

Find the $R_{eq}$ from the circuit.

• A. 18 $\Omega$
• B. 72/13 $\Omega$
• C. 9 $\Omega$
• D. 36/13 $\Omega$

Hint:

Always reduce inner series/parallel sections first to avoid mistakes in equivalent resistance.

Answer 1

The Correct Option is C

Step 1: Combine resistors in branches.
Use series-parallel combinations: 6 $\Omega$ + 2 $\Omega$ = 8 $\Omega$
Then 8 $\Omega$ $\parallel$ 9 $\Omega$ → $R = \frac{72}{17}$ 
Step 2: Add with other series resistors.
After calculating all, the equivalent resistance becomes exactly 9 $\Omega$ 
Conclusion: $R_{eq} = 9$ $\Omega$