closed circuit: meaning, definition, pronunciation and examples
B2Formal / Technical
Quick answer
What does “closed circuit” mean?
A complete electrical or electronic pathway that allows current to flow without interruption.
Audio
Pronunciation
Definition
Meaning and Definition
A complete electrical or electronic pathway that allows current to flow without interruption.
A system operating in isolation, not accessible to or shared with outsiders; often used metaphorically for insular systems, groups, or broadcasting.
Dialectal Variation
British vs American Usage
Differences
No significant differences in core meaning. 'Closed-circuit television' is the standard term on both sides; 'CCTV' is universally used as the abbreviation.
Connotations
In both varieties, strongly associated with surveillance, security, and controlled, private systems.
Frequency
Equally frequent in technical and security-related contexts in both BrE and AmE.
Grammar
How to Use “closed circuit” in a Sentence
operate as a [closed circuit]be connected in a [closed circuit]be broadcast on a [closed circuit]Vocabulary
Collocations
Examples
Examples of “closed circuit” in a Sentence
adjective
British English
- The lecture was shown on a closed-circuit feed to overflow rooms.
- All prisons have extensive closed-circuit monitoring.
American English
- The CEO's announcement was broadcast on a closed-circuit system to all branches.
- The lab uses a closed-circuit water-cooling system.
Usage
Meaning in Context
Business
Refers to internal, confidential communications or training broadcasts not shared publicly.
Academic
Used in physics/engineering for electrical circuits; in social sciences, metaphorically for insular systems of thought or power.
Everyday
Almost exclusively associated with security cameras (CCTV).
Technical
Describes a complete electrical pathway or a video/audio transmission system with a dedicated, private connection.
Vocabulary
Synonyms of “closed circuit”
Strong
Neutral
Weak
Vocabulary
Antonyms of “closed circuit”
Watch out
Common Mistakes When Using “closed circuit”
- Using 'close circuit' (incorrect adjective form). Confusing it with 'short circuit'. Using it as a verb (e.g., 'The system closed-circuited the signal' is non-standard).
FAQ
Frequently Asked Questions
It is a two-word compound noun, typically hyphenated when used attributively before another noun (e.g., closed-circuit television).
A 'closed circuit' is a properly functioning, complete loop. A 'short circuit' is a fault where current takes an unintended shortcut, often causing damage.
No, it is not standard to use it as a verb. It functions as a noun or an attributive noun (adjective).
CCTV stands for Closed-Circuit Television, a system where video signals are transmitted privately to a limited set of monitors.
A complete electrical or electronic pathway that allows current to flow without interruption.
Closed circuit is usually formal / technical in register.
Closed circuit: in British English it is pronounced /ˌkləʊzd ˈsɜː.kɪt/, and in American English it is pronounced /ˌkloʊzd ˈsɝː.kɪt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “a closed-circuit world (metaphorical for an insular community)”
- “operating in a closed circuit (working in isolation)”
Learning
Memory Aids
Mnemonic
Think of a circle that is CLOSED, so nothing gets in or out—just like the electric current or video signal in a CLOSED CIRCUIT.
Conceptual Metaphor
ISOLATION IS A CLOSED LOOP; PRIVACY/ SECURITY IS A SEALED PATH.
Practice
Quiz
In which context is 'closed circuit' used metaphorically?