Final answer:
The self-induced voltage across an inductance is equal to the change in current with respect to time, and it opposes the change in current.
Step-by-step explanation:
The self-induced voltage across an inductance is equal to the change in current with respect to time.
According to Lenz's law, the emf opposes the change in current. This is represented by the negative sign in the equation.
The unit of self-inductance is the henry (H), where 1 H = 1 V·s/A. The self-inductance of an inductor is proportional to how much flux changes with current.