AC - resonance circuits

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The graph beneath shows the impedance Z as a function of frequency f for a series circuit of a resistor R, a coil L and a capacitor C. Use the sliders to control the values of R, L and C and use the select-boxes to change units. Start.

 x 1 milliohm x 10 milliohm x 100 milliohm x 1 ohm x 10 ohm x 100 ohm x 1 kiloohm x 10 kiloohm x 100 kiloohm x 1 megaohm x 10 megaohm x 1 nanohenry x 10 nanohenry x 100 nanohenry x 1 mikrohenry x 10 mikrohenry x 100 mikrohenry x 1 millihenry x 10 millihenry x 100 millihenry x 1 henry x 10 henry x 1 nanofarad x 10 nanofarad x 100 nanofarad x 1 mikrofarad x 10 mikrofarad x 100 mikrofarad x 1 millifarad x 10 millifarad x 100 millifarad x 1 farad x 10 farad

When the capacitor has a capacitance on C = 100 nF, what inductance L must the coil posess if the resonance frequency is to be 2 kHz?  (Answer).

Determine the impedance Z at the frequency f = 70 Hz, when R = 310 W, C = 3100 nF and L = 810 mH.  (Answer).

Why do we say that the impedance is pure ohmic at the resonance frequency?  (Answer).

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