Question

A coil has an inductance of $\frac{2.2}{\pi }H$ and is joined in series with a resistance of $220\Omega$. When an alternating emf of 220 V at 50 c.p.s is applied to it, then the wattless component of the rms current in the circuit is ?

• A. $0.5A$
• B. $0.7A$
• C. $5A$
• D. $7A$

Answer 1

The correct option is A $0.5A$

$Isin\varphi =\frac{V}{Z}.\frac{X_L}{Z}=\frac{220\times 220}{{220}^2}=\frac{1}{2}=0.5A$