Question

The impedance of a choke coil is $25\Omega$ and its reactance is $24\Omega$. The resistance of the choke coil is

• A. $1\Omega$
• B. $7\Omega$
• C. $13\Omega$
• D. $25\Omega$

Answer 1

The correct option is B $7\Omega$

$Z=\sqrt{R^2+{X_L}^2}$
$R^2=Z^2-{X_L}^2={25}^2-{24}^2$
$R=7$