* Referring to your printed notes; either copy these notes or annotate your printed notes

Inductors in dc Circuits
NB
1) Induction will occur when the coil of wire experiences a changing magnetic field, which can itself be induced by an increasing or decreasing (changing) current.
2) The self-induced emf will oppose the emf of the supply.
3) The self-induced emf is ONLY present when the dc current is changing.


Notice that the back emf is present when the current increases or decreases but is absent when the current reached its maximum. 

This opposition to the flow of current controls the time taken for the current to reach it's maximum but has no bearing on the value of the maximum current in the circuit.

The graphs below show how the time taken for current growth and decay are affected by the inductance of the inductor coil.