1. An act or instance of going or moving around.
2. A circular journey or one which begins and ends at the same place; around.
3. A roundabout journey or course.
4. A periodical journey from place to place, to perform certain duties, as by judges who hold court, ministers who preach, or salespeople covering a route.
5. The route followed, places visited, or districts covered by people who make journeys to perform their duties.
6. The line going around or bounding any area or object; the distance around an area or object.
7. The space within a bounding line or district: "The circuit of the valley was a beautiful drive."
8. In the electrical field, an electric circuit or the complete path of an electric current, including the generating apparatus, intervening resistors, or capacitors.
9. In telecommunications, a means of transmitting communication signals or messages, usually consisting of two channels for interactive communication.
10. A number of theaters, nightclubs, etc., controlled by the same owner or manager or visited in turn by the same entertainers or acting companies.
11. Etymology: from about 1382, Old French circuit, from Latin circuitus, "a going around", from the stem of circuire, circumire, "to go around", from circum, "around" + -ire, "to go".

1. An unbroken path of material that carries electricity via an electrical conductor; such as, copper wire.

Electric lights, televisions, radios, and other electrical instruments function because of an electric circuit that starts at a power plant which generates electricity and ends up where people have outlets that allow the electric current to perform.

2. The path of the electron flow from a generating source through various components and back to the generating source.
3. A closed path that conveys an electric current through a conducting material which can be made of ionized gases or ionized liquids, but metals are most commonly used.

The most simple electric circuit consists of a source of electricity; such as, a battery and a conducting material as a wire

Current flows from the positive terminal of the battery through the wire to the negative terminal.

A resistor; such as, a light bulb can be added to the circuit, as can a switch that can be used to open the wire. Current flowing through the wire will light the bulb unless the switch is used to cut the circuit off.

The mathematical analysis of conditions and relationships in an electric circuit.

A circuit that exhibits resonance at one or more frequencies, and which is capable of storing electric energy over a band of frequencies continuously distributed around the resonant frequency; such as, a coil and capacitor in parallel.

1. A circuit which contains active electric parts; such as, electron tubes, electron transistors, and magnetic amplifiers, etc., as opposed to a circuit that contains only passive components; such as, resistors and switches.
2. An electric circuit in which the balance of electrons in a given electric part; such as, a tube, transistor, or amplifier, is disturbed by something other than an applied electric voltage.
3. An electric circuit having at least one element that manipulates the voltage or current in the circuit.

A microelectronic semiconductor device comprising many interconnected transistors and other components. Most RFID tags have ICs.

An individual wavelength of light for transmitting data on a strand of fiber-optic cable.

Using separate lasers, each tuned to a slightly different frequency, multiple lambdas can be projected down a single fiber strand to carry multiple streams of data.

DWDM (dense wavelength division multiplexing) is the technology for projecting multiple lambda circuits on fiber strands. Currently, 200 lambdas per fiber is common, but thousands are possible.

A circuit that originates from center taps on two side circuits, with no additional wire lines.

An electrical circuit in which each component is joined end-to-end successively with the next, so that the same current flows through each component.