# Circuit

Circuit may refer to:

## Science and technology
### Electrical engineering

* Electrical circuit, a complete electrical network with a closed-loop giving a return path for current
** Analog circuit, uses continuous signal levels
** Balanced circuit, paths are impedance-matched
** Circuit analysis, the process of finding the voltages across, and the currents through, every component in an electrical circuit
** Circuit diagram, a graphical representation of an electrical circuit
** Digital circuit, uses discrete signal levels
** Electronic circuit, contains "active" (nonlinear) electronic components capable of performing amplification, computation, and data transfer
*** Asynchronous circuit, or self-timed circuit, a sequential digital logic circuit that is not governed by a clock circuit or global clock signal
*** Integrated circuit, a set of electronic circuits on a small "chip" of semiconductor material
**** Mixed-signal integrated circuit, contains both analog and digital signals
*** Synchronous circuit, a digital circuit in which the changes in the state of memory elements are synchronized by a clock signal
** Printed circuit board, on which electronic components are supported and connected using copper tracks on a non-conductive substrate
** Series and parallel circuits, two ways in which electrical components may be interconnected
** Simple filters, including:
*** LC circuit or tank circuit, consisting of an inductance and a capacitance
*** RC circuit, comprises a resistance and a capacitance
*** RL circuit, comprises a resistance and an inductance
*** RLC circuit, comprises a resistance, an inductance, and a capacitance
** Telecommunication circuit, on which information is transmitted
** Nonlinear circuit, a circuit with nonlinear elements.

### Mathematics and computer science

* Circuit (computer theory), a theoretical structure simulating electrical and data paths
** Boolean circuit, a mathematical model for digital logic circuits
** Integer circuit, a mathematical object of computational complexity
* Circuit complexity, a branch of computational complexity theory
* Cycle (graph theory), a closed path, with no other repeated vertices than the starting and ending vertices
* Circuit of a matroid

### Other sciences

* Biological neural network, in neuroscience
* Hydraulic circuit, in fluid mechanics
* Magnetic circuit, in physics, one or more closed loop paths containing a magnetic flux
* Monetary circuit theory, a heterodox theory of monetary economics, also called circuitism
* Pneumatic circuit, in fluid mechanics
* Synthetic biological circuit, in synthetic biology

## Arts, entertainment, and media

* Circuit (film), a 2001 gay-themed film set in the world of gay circuit parties
* Mario Kart: Super Circuit, a 2001 Game Boy Advance game and the third game in the Mario Kart series
* Circuit (film character), a character from the Indian film series Munna Bhai
* Circuit, a character from Power Rangers Time Force
* Circuitt, a 2023 Indian Marathi-language action thriller film starring Vaibhav Tatwawadi and Hruta Durgule in lead roles.

## Church

* Circuit (LCMS), a local grouping of congregations in the Lutheran Church–Missouri Synod
* Methodist Circuit, a form of church governance in Methodism

## Government and law

* Circuit (administrative division), an administrative country subdivision in East Asia
* Circuit court, the name of court systems in several common law jurisdictions

## Sports

* Circuit training, a form of high-intensity aerobics
* ITF Pro Circuit, pro tennis tours of the International Tennis Federation
** ITF Men's Circuit
** ITF Women's Circuit

## Transportation and racing

* Circuit (airfield), also called pattern, a standard path followed by aircraft when taking off or landing
* Circuit, a race track or one complete traverse of a track
** Formula One circuits (see list of Formula One circuits)
** Kart circuit, a race track designed for kart racing

## Other uses

* Circuit (software), a collaboration service software by Unify
* Circuit, slang for hangouts or events frequented by a given social circle
* Circuit party, a gay dance event