0 H that has a 10 A current flowing through it.
To illustrate this, consider a device with L = 1.
To avoid this effect, a small L L must be achieved, such as by counterwinding coils as in Figure 23.38.Ī 1 H inductor is a large inductor. For example, a large coil with many turns and an iron core has a large L L and will not allow current to change quickly. The larger the self-inductance L L of a device, the greater its opposition to any change in current through it. Units of self-inductance are henries (H) just as for mutual inductance. The minus sign is an expression of Lenz’s law, indicating that emf opposes the change in current.
