Question

Find the equivalent resistance between the points $A$ and $B$.

• A. $1.5\Omega$
• B. $3\Omega$
• C. $5\Omega$
• D. $15\Omega$

Answer 1

The correct option is B $3\Omega$

3 Ohm and 2 Ohm resistors are in series to form (3+2)= 5 Ohm
6 Ohm and 4 Ohm resistors are in series to form (6+4)= 10 Ohm.
5 Ohm, 30 Ohm and 10 Ohm are in parallel and give equivalent resistance,
$\frac{1}{R}=\frac{1}{5}+\frac{1}{30}+\frac{1}{10}$
$R=3\text{Ohm}$