An 8 kW single phase load at power factor of 0.8 leading is supplied from a single- phase ac supply. Reactive power drawn from the source is:

Correct option is A

​$$\textbf{Given:} \\[6pt]\bullet \ \text{Active power } P = 8 \text{ kW} \\[4pt]\bullet \ \text{Power factor } \cos\phi = 0.8 \text{ (leading)} \\[12pt]\text{First find the phase angle:} \\[8pt]\phi = \cos^{-1}(0.8) \\[10pt]\tan\phi = \frac{\sin\phi}{\cos\phi} = \frac{0.6}{0.8} = 0.75 \\[14pt]\text{Reactive power is:} \\[8pt]Q = P \tan\phi \\[10pt]Q = 8 \times 0.75 = 6 \text{ kVAr}$$​​