| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Determine the capacitance of the capacitor and the phase between the voltage and the electric current.
Answer: $210\ \mu F$ ; $-56°$