||In a device which consumes power the anode is positive, and in a device which provides
power the anode is negative.
||A luminous electrical gas discharge characterized by very high current. The intense
ionization necessary to maintain the large current is provided mainly by the evaporation of the
electrodes, which are raised to incandescence by the discharge (the enormous heat produced is
utilized in arc-welding). This is a low voltage (10s) high current (100s) phenomena.
||Opposite of an anode.
||A gaseous mass.
||Only a small fraction of the atoms in a gas are ionised and the electrons reach a very
high temperature but the ions are at ambient temperature. Typically created by high voltage
||The glowing region of air surrounding a conductor when the potential gradient around it
exceeds a critical value.
||A type of electric discharge that results when partial breakdown of the surrounding gas
takes place. This is a high voltage low current phenomena.
||A two terminal electronics device with no control grid that only allows current to pass
in one direction. Sometimes with additional effect such as light emission.
||The description for a conventional diaphragm loudspeaker with coil and magnet actuator.
Dynamics is the branch of physics concerned with forces that cause motion of bodies.
||Sound produced by electronic means.
||Electricity and motion/movement combined.
||A device that covers all of the human hearing spectrum, typically from 20Hz to
||An electric discharge through a gas, usually at a low pressure, in which the gas
becomes luminous. Neon signs utilize glow discharge. This is a medium voltage (hundreds), medium
current (10s of mA) phenomena.
||A device (wire mesh/ring/rod) to control electron flow between anode and cathode with a
small electrical signal.
||High Fidelity. The reproduction of sound with a minimum of distortion.
||Where full ionisation has taken place and the ions and electrons are in thermal
equilibrium, e.g. the Sun, nuclear fusion.
|Hz / Hertz
||Cycles per second.
||An atom that has either lost or gained one or more electrons making it positively
(cation) or negatively (anion) charged.
||The process of making Ions.
||Thousands of cycles per second.
||A device for producing sound from an electrical input.
||A middle frequency loudspeaker, typically from 250Hz to 3kHz, e.g. vocal and lead
||See Cold Plasma
||A highly ionised gas. The fourth state of matter.
||A visible discharge of electricity between two places. Preceded by ionization of the
path, there is a rapid heating effect of the air through which the spark passes, which creates a
sharp crackling noise.
||A device for converting a nonelectrical signal into an electrical one, or
||A three terminal electronic device, usually a thermionic vacuum tube with a grid to
control the flow from cathode to anode.
||A high frequency loudspeaker, typically from 3kHz to 20KHz and above, e.g. cymbal
||An air current.
||A low frequency loudspeaker, typically from 250Hz to 20Hz and below, e.g. bass