RESONANCE is a condition that exists in a circuit when inductance, capacitance, and the applied
frequency are such that inductive reactance and capacitive reactance cancel each other.
Formula for resonant frequency (fr):
NOTE: The formula for resonance is the same for series or parallel circuits when XL = X
Semiconductor devices that have three or more elements are called TRANSISTORS. The term is
derived from TRANSfer and resISTOR. This term describes the operation of the transistor the transfer
of an input signal current from a low-resistance circuit to a high-resistance circuit.
Some transistor formulas are shown below.
Transistor total current: