The user provided an image containing mathematical formulas. The request is to extract these formulas and present them in a structured format.

Формулы:

1. \( I = \frac{U}{R} \)
2. \( Q = I^2 R \Delta t \)
3. \( A = IU \Delta t \)
4. \( F = BIl \sin a \)
5. \( F_{n} = qvB \sin a \)
6. \( E_{i} = vBl \sin a \)
7. \( L = \frac{\Phi}{I} \)