ABSTRACT
This chapter talks about the current and voltage changes that occur in a circuit when there is a change in applied voltage. For a purely resistive circuit, the circuit current will be proportional to the applied voltage. When a voltage is applied to a capacitor and current flows to one of its plates and from the other, it becomes charged. The current and voltages that occur in the circuit while they are reacting to the change in input voltage and changing to their steady state values are termed transients. Such transients occur whenever the applied voltage changes and thus can occur, when people apply a constantly changing input voltage or switch on a sinusoidal alternating voltage. The changing current in the inductance generates a changing magnetic field in the inductance coil and generates an electromotive force (e.m.f) which slows down the changing current. The back e.m.f. depends on the rate of increase of the current through the inductor.
