Angular frequency

Using "ordinary" revolutions-per-second frequency, this equation would be

Adding series resistance (for example, due to the resistance of the wire in a coil) does not change the resonant frequency of the series LC circuit. For a parallel tuned circuit, the above equation is often a useful approximation, but the resonant frequency does depend on the losses of parallel elements.

Angular frequency is often loosely referred to as frequency, although in a strict sense these two quantities differ by a factor of 2π.