spark gap

space between two conducting electrodes across which an electrical or spark discharge can occur

A spark gap consists of an arrangement of two conducting electrodes separated by a gap usually filled with a gas such as air. When a suitable voltage is supplied, a spark forms, ionizing the gas and drastically reducing its electrical resistance. An electric current then flows until the path of ionized gas is broken or the current reduces below a minimum value called the 'holding current'. This usually happens when the voltage drops, but in some cases occurs when the heated gas rises, stretching out and then breaking the filament of ionized gas. Usually the action of ionizing the gas is violent and disruptive, often leading to sound (ranging from a snap for a spark plug to thunder for a lightning discharge), light and heat.
See more at Wikipedia.org...

Noun
1. a component of an ignition system; consists of two shaped electrodes and the space between them
(hypernym) component, constituent, element
(part-holonym) ignition, ignition system
2. the gap between two high-potential terminals
(hypernym) gap, crack
(part-holonym) induction coil

spark-gap /'spɑ:kgæp/
danh từ (kỹ thuật) khoảng đánh lửa
(C) 2007 www.TừĐiểnTiếngViệt.net

danh từ
(kỹ thuật) khoảng đánh lửa