A 60-Hz 240-V-rms source supplies power to a load consisting of a resistance in series with an inductance. The real poweris 1500W, and the apparent power is 2500 VA. Determine the value of the resistance and the value of the inductance.

Respuesta :

Answer:

Resistance will be 13.824 ohm

And inductance will be 0.048 Henry

Explanation:

We have given real power P = 1500 watt

And apparent power S = 2500 VA

Voltage V = 240 volt

Frequency f = 60 Hz

Power factor [tex]cos\Phi[/tex] is given by

[tex]cos\Phi =\frac{P}{S}=\frac{1500}{2500}=0.6[/tex]

And real power is given by [tex]P=VIcos\Phi[/tex]

So [tex]1500=240\times I\times 0.6[/tex]

I = 10.4166 A

Now impedance [tex]Z=\frac{V}{I}=\frac{240}{10.4166}=23.04ohm[/tex]

And [tex]cos\Phi =\frac{R}{Z}[/tex]

So [tex]0.6=\frac{R}{23.04}[/tex]

R = 13.824 ohm

Impedance is given by [tex]Z=\sqrt{R^2+X_L^2}[/tex]

[tex]23.04=\sqrt{13.824^2+X_L^2}[/tex]

Squaring both side

[tex]530.84=191.10+X_L^2[/tex]

[tex]X_L=18.43ohm[/tex]

[tex]18.43=2\times 3.14\times 60\times L[/tex]

L = 0.048 Henry