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", a character from the Munna Bhai film series Circuit, a character from Power Rangers Time Force