11 Facts About Electrical noise

In electronics, noise is an unwanted disturbance in an electrical signal.

In particular, Electrical noise is inherent in physics, and central to thermodynamics.

Electronic Electrical noise is a common component of Electrical noise in signal processing.

In communication systems, Electrical noise is an error or undesired random disturbance of a useful information signal in a communication channel.

The Electrical noise is a summation of unwanted or disturbing energy from natural and sometimes man-made sources.

Different types of Electrical noise are generated by different devices and different processes.

Johnson–Nyquist noise is unavoidable, and generated by the random thermal motion of charge carriers, inside an electrical conductor, which happens regardless of any applied voltage.

Thermal Electrical noise is approximately white, meaning that its power spectral density is nearly equal throughout the frequency spectrum.

Where current divides between two paths, Electrical noise occurs as a result of random fluctuations that occur during this division.

Thermal Electrical noise can be reduced by cooling of circuits - this is typically only employed in high accuracy high value applications such as radio telescopes.

The spectral distribution of Electrical noise can vary with frequency, so its power density is measured in watts per hertz .