The role of inductance in the circuit
DC: the so-called direct current refers to the DC circuit, the role of inductance is equivalent to a wire, can not play any role
inductor is usually a coil, the magnetic field can be gathered. (the exception is mutual inductance)
On the basis of Lenz's law, the magnetic flux will borrow the voltage by induction (EMF) and tend to resist a change in current. The ratio of change in magnetic flux changing the amount of current is called self inductance,
Any of the current in the circuit, will produce a magnetic field, the magnetic flux and the circuit.
