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Johnson–Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.
resistors: the braking resistors of electric trains, used to dissipate electrical power when the catenary is not receptive during braking, can make electromagnetically induced acoustic noise; coils: in magnetic resonance imaging, "coil noise" is that part of total system noise attributed to the receiving coil, due to its non-zero temperature.
Demonstrations in Physics was an educational science series produced in Australia by ABC Television in 1969 [citation needed].The series was hosted by American scientist Julius Sumner Miller, who demonstrated experiments involving various disciplines in the world of physics.
Ancient Greek philosopher Thales of Miletus described static electricity by rubbing fur on substances such as amber. 1600: English scientist William Gilbert coined the word electricus after careful experiments. He also explained the magnetism of Earth. 1660: German scientist Otto von Guericke invented a device that creates static electricity ...
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Electricity (electrical circuit) 444 Optics: 234 Particle model: 226 Thermal physics (heat/temp.) 192 Energy: 176 Astronomy (Earth in space) 121 Quantum physics: 77 Nonlinear systems (chaos) 35 Sound: 28 Magnetism: 25 Relativity: 8
During commercial powder processing [3] [125] [126] or in natural processes such as dust storms, [127] [128] [8] triboelectric charge transfer can occur. There can be electric fields of up to 160kV/m with moderate wind conditions, which leads to Coulomb forces of about the same magnitude as gravity. [129]
[3] Power sum near-end crosstalk (PSNEXT) PSNEXT is a NEXT measurement which includes the sum of crosstalk contributions from all adjacent pairs as an algebraic sum of the NEXT of the three wire pairs as they affect the fourth pair in a four-pair cable (e.g., Category 6 cable). [ 3 ]