﻿ Dissipation factor

# Dissipation factor

The loss factor (English: dissipation factor, abbreviated DF) describes in physical oscillations of different nature, including in electrical engineering and the rheology, the ratio of the lossy to lossless real part imaginary part of a complex quantity. The loss factor is equal to the tangent of the loss angle between the complex size and its imaginary part.

## Electrical Engineering

### Energy

The loss factor indicates how large are the losses in electrical components such as inductors and capacitors, or in the propagation of electromagnetic waves in matter ( eg, air). With "loss" here is meant the energy that is electrically or electromagnetically lost and, for example, into heat (dissipation ). These losses by the electromagnetic wave is attenuated.

For a more detailed illustration of the loss factor is considered a capacitor, which is connected to a voltage source with a sinusoidal voltage waveform over time. In such a condenser, a phase shift between voltage and current:

• An ideal capacitor having no losses, has a phase shift of ( radians)
• In a real capacitor which has losses, the phase shift of the loss angle is less than:

### Resonant circuit

As loss factor d ( damping; dissipation factor DF in English ) is also the inverse of the quality factor Q is in resonant circuits and filters: