Definition

Noun: 1. The physical space between two electrodes: A spark gap is the precise distance separating two conductive terminals designed to have a high electrical potential difference. When the voltage across this gap exceeds the dielectric strength of the intervening medium (like air), a spark (an electrical discharge) jumps across it. 2. A device or component: A spark gap is also the name for the complete component itself, consisting of two shaped electrodes and the insulating space between them, used to create a controlled spark for purposes such as ignition or electrical switching.

Usage Examples

• As the physical space:
  • The technician adjusted the spark gap to ensure a more reliable ignition spark.
  • A wider spark gap requires a higher voltage to create a discharge.
• As the component:
  • Early radio transmitters used a spark gap to generate radio waves.
  • The lawnmower's engine won't start; the spark gap might be fouled or incorrectly set.

Advanced Usage

• Quenching: Some advanced spark gaps are designed to "quench" or extinguish the spark quickly to allow for rapid, repeated firing. This is common in certain types of protective devices and historical radio equipment.
• Triggered Spark Gaps: These are sophisticated versions where a small control pulse initiates the main spark, allowing for very precise timing, used in applications like pulsed lasers and some types of research equipment.

Variants and Related Words

• Spark (n/v): The visible electrical discharge itself, or the act of producing such a discharge.
  • A single spark from the faulty wire started the fire.
• Electrode (n): A conductor through which electricity enters or leaves a component, such as one of the two terminals in a spark gap.
• Ignition Point/Gap: A specific term for the spark gap within an internal combustion engine's spark plug.
• Arc Gap: A related term often used for a sustained electrical discharge (an arc), as opposed to a brief spark.

Synonyms

• Air gap (when the medium is air, though this is a more general engineering term).
• Discharge gap.
• Ignition gap (specific to engine contexts).

Related Components and Systems

• Spark Plug: A specific type of spark gap device used in internal combustion engines. The spark gap is the critical space between the spark plug's center and ground electrodes.
• Ignition Coil: The component that generates the high voltage needed to jump across the spark gap in an engine.
• Lightning Arrestor: A protective device that often uses a spark gap to safely divert lightning strikes or voltage surges to ground.

Noun

1. the gap between two high-potential terminals
2. a component of an ignition system; consists of two shaped electrodes and the space between them