ABSTRACT
Aresonant circuit is one in which there is resistance and a combination of inductive and capacitive reactance. In such circuits there will be one particular frequency at which the current and voltage are exactly in phase and since the reactive components effectively cancel one another out, the circuit behaves like one that contains only pure resistance. This can be extremely useful in a number of applications that require circuits to be selective, e.g. accepting or rejecting current within a particular band of frequencies. This chapter provides you with an introduction to the behaviour and application of resonant circuits.
