| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
How much does the measured secondary voltage differ (in volts and percentage) from the predicted secondary voltage of the ideal transformer?
Answer: 0,15 V; 4,6 %