Question

If $R_L=5\Omega$, the approximate power consumption in the load is

• A. 700 W
• B. 750 W
• C. 800 W
• D. 850 W

Answer 1

The correct option is B 750 W

Given,
$R_L=5\Omega$

$\therefore cos\varphi =\frac{R_L}{\left|Z\right|}$

$\Rightarrow \left|Z\right|=\frac{5}{0.45}=11.11$

Power consumed by load

$P_L={\left(\frac{V_3}{\left|Z\right|}\right)}^2{R}_L$

$={\left(\frac{136}{11.11}\right)}^2\times 5=749.1$

$\simeq 750W$