soledadvigil2483 soledadvigil2483
  • 14-09-2019
  • Physics
contestada

What resistance is needed in series with a 10-uF capacitor
at1.0kHz for a total impedance of 45 Ohm?

Respuesta :

aristeus aristeus
  • 17-09-2019

Answer:

The value of resistance will be 42.08 ohm    

Explanation:

We have given capacitance [tex]C=10\mu F=10\times 10^{-6}F[/tex]

Frequency f = 1 kHz = 1000 Hz

Impedance Z = 45 ohm

Capacitive reactance [tex]X_C=\frac{1}{\omega C}=\frac{1}{2\pi fC}=\frac{1}{2\times 3.14\times 1000\times 10^{-5}}=15.92ohm[/tex]

We know that impedance is given by [tex]Z=\sqrt{R^2+X_C^2}[/tex]

[tex]45=\sqrt{R^2+15.92^2}[/tex]

Squaring both side [tex]2025=R^2+253.4464[/tex]

R = 42.08 ohm

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