2.2 Reactance and impedance

I declare: solidlikelyshaky

1. Calculate the reactance of a capacitor and an inductor at a given frequency, and say which rises when frequency rises.
2. Calculate the impedance of a series RC or RL, magnitude and phase, then verify it by measuring current and voltage.
3. Explain with a drawing why current leads in a capacitor and lags in an inductor.
4. Choose a decoupling capacitor by its reactance at the frequency of the noise you want to kill.
5. Explain the decoupling of a capacitor and an inductor in parallel on a supply: who passes what.
6. Diagnosis: a filter that "doesn’t filter", show that the inductor has series resistance or the capacitor’s ESR is too high.