**9**

- Sorry, no translations

**10**

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.

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).

**11**

- Sorry, no translations

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