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March 29, 2017

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A 1200 ohms resistance of AC 0.07H inductance coil and a 0.001mF capacitor are in series across a 120V source determine.

a.frequency.
b.current.
c.impedance.

  • MONGU COLLEGE - ,

    Is the inductive reactance of the coil 1200 ohms? If so:

    a. Xl = 2pi*F*L = 1200 Ohms.
    F=Xl/(2pi*L)=1200/(6.28*0.07)=2728.4 Hz.

    b. Xc = 1/(2pi*F*C)
    Xc=1/(6.28*2728.4*0.001*10^-6)=58333 Ohms
    Z = Xl+ Xc=1200 + (-58333)=-57133 Ohms,
    Capacitive. = 57133@(-90) Deg.
    I = V/Z = 120/57133=2.1*10^-3A @ 90 Deg.

    c. Z was calculated in under b.

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